diff --git a/src/main/java/com/netgrif/application/engine/pfql/domain/antlr4/QueryLang.g4 b/src/main/java/com/netgrif/application/engine/pfql/domain/antlr4/QueryLang.g4
index 2c7918dfb5..55867f5289 100644
--- a/src/main/java/com/netgrif/application/engine/pfql/domain/antlr4/QueryLang.g4
+++ b/src/main/java/com/netgrif/application/engine/pfql/domain/antlr4/QueryLang.g4
@@ -98,6 +98,7 @@ userAttribute: ID
              ;
 
 // resource comparisons
+// todo: authorComparison for process?
 processComparisons: idComparison
                   | identifierComparison
                   | versionComparison
@@ -228,12 +229,12 @@ tasksUserIdComparison: tasksUserId SPACE stringComparison # tasksUserIdBasic
                      ;
 
 // basic comparisons
-objectIdComparison: (NOT SPACE?)? op=(EQ | NEQ) SPACE STRING ;
-stringComparison: (NOT SPACE?)? op=(EQ | NEQ | CONTAINS | LT | GT | LTE | GTE) SPACE STRING ;
+objectIdComparison: (NOT SPACE?)? op=(EQ | NEQ) SPACE (STRING | LOGGED_USER_ID) ;
+stringComparison: (NOT SPACE?)? op=(EQ | NEQ | CONTAINS | LT | GT | LTE | GTE) SPACE (STRING | loggedUserStringAttribute) ;
 numberComparison: (NOT SPACE?)? op=(EQ | NEQ | LT | GT | LTE | GTE) SPACE number=(INT | DOUBLE) ;
 dateComparison: (NOT SPACE?)? op=(EQ | NEQ | LT | GT | LTE | GTE) SPACE DATE ;
 dateTimeComparison: (NOT SPACE?)? op=(EQ | NEQ | LT | GT | LTE | GTE) SPACE DATETIME ;
-booleanComparison: (NOT SPACE?)? op=(EQ | NEQ) SPACE BOOLEAN ;
+booleanComparison: (NOT SPACE?)? op=(EQ | NEQ) SPACE (BOOLEAN | LOGGED_USER_ANONYMOUS) ;
 
 // in list/in range comparisons
 inListStringComparison: (NOT SPACE?)? op=IN SPACE? stringList ;
@@ -326,13 +327,13 @@ ASC: A S C ;
 DESC: D E S C ;
 
 // basic types
-stringList: '(' SPACE? (STRING SPACE? (',' SPACE? STRING SPACE? )* )? SPACE? ')' ;
+stringList: '(' SPACE? ((STRING | loggedUserStringAttribute) SPACE? (',' SPACE? (STRING | loggedUserStringAttribute) SPACE? )* )? SPACE? ')' ;
 intList: '(' SPACE? (INT SPACE? (',' SPACE? INT SPACE? )* )? SPACE? ')' ;
 doubleList: '(' SPACE? (DOUBLE SPACE? (',' SPACE? DOUBLE SPACE? )* )? SPACE? ')' ;
 dateList: '(' SPACE? (DATE SPACE? (',' SPACE? DATE SPACE? )* )? SPACE? ')' ;
 dateTimeList: '(' SPACE? (DATETIME SPACE? (',' SPACE? DATETIME SPACE? )* )? SPACE? ')' ;
 versionList: '(' SPACE? (VERSION_NUMBER SPACE? (',' SPACE? VERSION_NUMBER SPACE? )* )? SPACE? ')' ;
-stringRange: leftEndpoint=('(' | '[') SPACE? STRING SPACE? ':' SPACE? STRING SPACE? rightEndpoint=(')' | ']') ;
+stringRange: leftEndpoint=('(' | '[') SPACE? (STRING | loggedUserStringAttribute) SPACE? ':' SPACE? (STRING | loggedUserStringAttribute) SPACE? rightEndpoint=(')' | ']') ;
 intRange: leftEndpoint=('(' | '[') SPACE? INT SPACE? ':' SPACE? INT SPACE? rightEndpoint=(')' | ']') ;
 doubleRange: leftEndpoint=('(' | '[') SPACE? DOUBLE SPACE? ':' SPACE? DOUBLE SPACE? rightEndpoint=(')' | ']') ;
 dateRange: leftEndpoint=('(' | '[') SPACE? DATE SPACE? ':' SPACE? DATE SPACE? rightEndpoint=(')' | ']') ;
@@ -350,6 +351,13 @@ JAVA_ID: [a-zA-Z$_] [a-zA-Z0-9$_]* ;
 SPACE: [ ]+ ;
 ANY: . ;
 
+// place holders
+loggedUserStringAttribute: (LOGGED_USER_ID | LOGGED_USER_USERNAME | LOGGED_USER_FULLNAME);
+LOGGED_USER_ID: L O G G E D U S E R '.' I D ;
+LOGGED_USER_FULLNAME:  L O G G E D U S E R '.' F U L L N A M E ;
+LOGGED_USER_USERNAME:  L O G G E D U S E R '.' U S E R N A M E ;
+LOGGED_USER_ANONYMOUS: L O G G E D U S E R '.' A N O N Y M O U S ;
+
 // fragments
 fragment A : [aA];
 fragment B : [bB];
diff --git a/src/main/java/com/netgrif/application/engine/pfql/service/QueryLangEvaluator.java b/src/main/java/com/netgrif/application/engine/pfql/service/QueryLangEvaluator.java
index 27cf81a042..1124c8a3e1 100644
--- a/src/main/java/com/netgrif/application/engine/pfql/service/QueryLangEvaluator.java
+++ b/src/main/java/com/netgrif/application/engine/pfql/service/QueryLangEvaluator.java
@@ -1,6 +1,8 @@
 package com.netgrif.application.engine.pfql.service;
 
+import com.netgrif.application.engine.auth.domain.LoggedUser;
 import com.netgrif.application.engine.auth.domain.QUser;
+import com.netgrif.application.engine.auth.service.interfaces.IUserService;
 import com.netgrif.application.engine.petrinet.domain.QPetriNet;
 import com.netgrif.application.engine.pfql.domain.antlr4.QueryLangBaseListener;
 import com.netgrif.application.engine.pfql.domain.antlr4.QueryLangParser;
@@ -23,6 +25,7 @@
 import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.domain.Sort;
+import org.springframework.data.util.Pair;
 
 import java.sql.Timestamp;
 import java.time.LocalDateTime;
@@ -38,6 +41,8 @@ public class QueryLangEvaluator extends QueryLangBaseListener {
     private final ParseTreeProperty<String> elasticQuery = new ParseTreeProperty<>();
     private final ParseTreeProperty<Predicate> mongoQuery = new ParseTreeProperty<>();
 
+    private final IUserService userService;
+
     @Getter
     private QueryType resourceType;
     @Getter
@@ -57,6 +62,10 @@ public class QueryLangEvaluator extends QueryLangBaseListener {
     private int pageSize = 20;
     private final List<Sort.Order> sortOrders = new ArrayList<>();
 
+    public QueryLangEvaluator(IUserService userService) {
+        this.userService = userService;
+    }
+
     public void setElasticQuery(ParseTree node, String query) {
         elasticQuery.put(node, query);
     }
@@ -136,6 +145,123 @@ private void processConditionGroup(ParseTree child, ParseTree current, Boolean n
         setElasticQuery(current, elasticQuery);
     }
 
+    private String handleStringComparisonWithPlaceholders(QueryLangParser.StringComparisonContext ctx) {
+        if (ctx.STRING() != null) {
+            return getStringValue(ctx.STRING().getText());
+        }
+
+        if (ctx.loggedUserStringAttribute() != null) {
+            return handleLoggedUserStringAttribute(ctx.loggedUserStringAttribute());
+        }
+
+        throw new IllegalArgumentException("Wrong or missing query value on string comparison");
+    }
+
+    private ObjectId handleObjectIdComparisonWithPlaceholders(QueryLangParser.ObjectIdComparisonContext ctx) {
+        if (ctx.STRING() != null) {
+            return getObjectIdValue(ctx.STRING().getText());
+        }
+        if (ctx.LOGGED_USER_ID() != null) {
+            LoggedUser loggedUser = this.userService.getLoggedOrSystem().transformToLoggedUser();
+            return getObjectIdValue(loggedUser.getId());
+        }
+
+        throw new IllegalArgumentException("Wrong or missing query value on object id comparison");
+    }
+
+    private List<String> handleStringListComparison(QueryLangParser.StringListContext ctx) {
+        List<String> result = new ArrayList<>();
+
+        if (ctx.STRING() != null && !ctx.STRING().isEmpty()) {
+            result.addAll(ctx.STRING().stream()
+                    .map(node -> getStringValue(node.getText()))
+                    .collect(Collectors.toList()));
+        }
+        if (ctx.loggedUserStringAttribute() != null && !ctx.loggedUserStringAttribute().isEmpty()) {
+            result.addAll(ctx.loggedUserStringAttribute().stream()
+                    .map(this::handleLoggedUserStringAttribute)
+                    .collect(Collectors.toList()));
+        }
+
+        return result;
+    }
+
+    private List<ObjectId> handleObjectIdListComparison(QueryLangParser.StringListContext ctx) {
+        List<ObjectId> result = new ArrayList<>();
+
+        if (ctx.STRING() != null && !ctx.STRING().isEmpty()) {
+            result.addAll(ctx.STRING().stream()
+                    .map(node -> getObjectIdValue(node.getText()))
+                    .collect(Collectors.toList()));
+        }
+        if (ctx.loggedUserStringAttribute() != null && !ctx.loggedUserStringAttribute().isEmpty()) {
+            boolean hasIdAttribute = ctx.loggedUserStringAttribute().stream()
+                    .anyMatch(loggedUserCtx -> loggedUserCtx.LOGGED_USER_ID() != null);
+            if (hasIdAttribute) {
+                LoggedUser loggedUser = this.userService.getLoggedOrSystem().transformToLoggedUser();
+                result.add(getObjectIdValue(loggedUser.getId()));
+            }
+        }
+
+        return result;
+    }
+
+    private String handleLoggedUserStringAttribute(QueryLangParser.LoggedUserStringAttributeContext ctx) {
+        LoggedUser loggedUser = this.userService.getLoggedOrSystem().transformToLoggedUser();
+        if (ctx.LOGGED_USER_ID() != null) {
+            return loggedUser.getId();
+        }
+        if (ctx.LOGGED_USER_USERNAME() != null) {
+            return loggedUser.getUsername();
+        }
+        if (ctx.LOGGED_USER_FULLNAME() != null) {
+            return loggedUser.getFullName();
+        }
+        return "";
+    }
+
+    /// returns pair, where the first element is left value and the second element is right value
+    private Pair<String, String> handleInRangeStringComparison(QueryLangParser.StringRangeContext ctx) {
+        List<ParseTree> filteredChildren = ctx.children.stream()
+                .filter(node -> node instanceof TerminalNode && ((TerminalNode) node).getSymbol().getType() == QueryLangParser.STRING
+                        || node instanceof QueryLangParser.LoggedUserStringAttributeContext)
+                .collect(Collectors.toList());
+
+        if (filteredChildren.size() < 2) {
+            throw new IllegalArgumentException("Wrong in range values");
+        }
+
+        String left;
+        ParseTree leftNode = filteredChildren.get(0);
+        if (leftNode instanceof TerminalNode) {
+            left = getStringValue(leftNode.getText());
+        } else {
+            left = handleLoggedUserStringAttribute((QueryLangParser.LoggedUserStringAttributeContext) leftNode);
+        }
+
+        String right;
+        ParseTree rightNode = filteredChildren.get(1);
+        if (rightNode instanceof TerminalNode) {
+            right = getStringValue(rightNode.getText());
+        } else {
+            right = handleLoggedUserStringAttribute((QueryLangParser.LoggedUserStringAttributeContext) rightNode);
+        }
+
+        return Pair.of(left, right);
+    }
+
+    private String handleBooleanComparison(QueryLangParser.BooleanComparisonContext ctx) {
+        if (ctx.BOOLEAN() != null) {
+            return ctx.BOOLEAN().getText();
+        }
+        if (ctx.LOGGED_USER_ANONYMOUS() != null) {
+            LoggedUser loggedUser = this.userService.getLoggedOrSystem().transformToLoggedUser();
+            return String.valueOf(loggedUser.isAnonymous());
+        }
+
+        throw new IllegalArgumentException("Wrong or missing query value on boolean comparison");
+    }
+
     private Predicate getEmptyMongoQuery() {
         return new BooleanBuilder();
     }
@@ -399,7 +525,7 @@ public void exitIdBasic(QueryLangParser.IdBasicContext ctx) {
         Token op = ctx.objectIdComparison().op;
         boolean not = ctx.objectIdComparison().NOT() != null;
         checkOp(ComparisonType.ID, op);
-        ObjectId objectId = getObjectIdValue(ctx.objectIdComparison().STRING().getText());
+        ObjectId objectId = handleObjectIdComparisonWithPlaceholders(ctx.objectIdComparison());
 
         switch (resourceType) {
             case PROCESS:
@@ -428,12 +554,7 @@ public void exitIdList(QueryLangParser.IdListContext ctx) {
         Token op = ctx.inListStringComparison().op;
         boolean not = ctx.inListStringComparison().NOT() != null;
         checkOp(ComparisonType.ID, op);
-        List<ObjectId> objectIdList = ctx.inListStringComparison().stringList().STRING().stream()
-                .map(node -> getObjectIdValue(node.getText()))
-                .collect(Collectors.toList());
-        List<String> stringIdList = ctx.inListStringComparison().stringList().STRING().stream()
-                .map(node -> getStringValue(node.getText()))
-                .collect(Collectors.toList());
+        List<ObjectId> objectIdList = handleObjectIdListComparison(ctx.inListStringComparison().stringList());
 
         switch (resourceType) {
             case PROCESS:
@@ -441,6 +562,7 @@ public void exitIdList(QueryLangParser.IdListContext ctx) {
                 break;
             case CASE:
                 qObjectId = QCase.case$._id;
+                List<String> stringIdList = objectIdList.stream().map(ObjectId::toString).collect(Collectors.toList());
                 setElasticQuery(ctx, buildElasticQueryInList("stringId", stringIdList, not));
                 break;
             case TASK:
@@ -461,7 +583,7 @@ public void exitTitleBasic(QueryLangParser.TitleBasicContext ctx) {
         StringPath stringPath;
         Token op = ctx.stringComparison().op;
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         switch (resourceType) {
             case PROCESS:
@@ -485,7 +607,7 @@ public void exitTitleBasic(QueryLangParser.TitleBasicContext ctx) {
     public void exitTitleList(QueryLangParser.TitleListContext ctx) {
         StringPath stringPath;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream().map(node -> getStringValue(node.getText())).collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         switch (resourceType) {
             case PROCESS:
@@ -511,8 +633,7 @@ public void exitTitleRange(QueryLangParser.TitleRangeContext ctx) {
         boolean not = ctx.inRangeStringComparison().NOT() != null;
         boolean leftEndpointOpen = ctx.inRangeStringComparison().stringRange().leftEndpoint.getText().equals(LEFT_OPEN_ENDPOINT);
         boolean rightEndpointOpen = ctx.inRangeStringComparison().stringRange().rightEndpoint.getText().equals(RIGHT_OPEN_ENDPOINT);
-        String leftString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(0).getText());
-        String rightString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(1).getText());
+        Pair<String, String> leftAndRightStrings = handleInRangeStringComparison(ctx.inRangeStringComparison().stringRange());
 
         switch (resourceType) {
             case PROCESS:
@@ -520,7 +641,8 @@ public void exitTitleRange(QueryLangParser.TitleRangeContext ctx) {
                 break;
             case CASE:
                 stringPath = QCase.case$.title;
-                setElasticQuery(ctx, buildElasticQueryInRange("title", leftString, leftEndpointOpen, rightString, rightEndpointOpen, not));
+                setElasticQuery(ctx, buildElasticQueryInRange("title", leftAndRightStrings.getFirst(),
+                        leftEndpointOpen, leftAndRightStrings.getSecond(), rightEndpointOpen, not));
                 break;
             case TASK:
                 stringPath = QTask.task.title.defaultValue;
@@ -529,7 +651,8 @@ public void exitTitleRange(QueryLangParser.TitleRangeContext ctx) {
                 throw new IllegalArgumentException("Unknown query type: " + resourceType);
         }
 
-        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftString, leftEndpointOpen, rightString, rightEndpointOpen, not));
+        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftAndRightStrings.getFirst(), leftEndpointOpen,
+                leftAndRightStrings.getSecond(), rightEndpointOpen, not));
     }
 
     @Override
@@ -537,7 +660,7 @@ public void exitIdentifierBasic(QueryLangParser.IdentifierBasicContext ctx) {
         StringPath stringPath = QPetriNet.petriNet.identifier;
         Token op = ctx.stringComparison().op;
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, buildStringPredicate(stringPath, op.getType(), string, not));
     }
@@ -546,7 +669,7 @@ public void exitIdentifierBasic(QueryLangParser.IdentifierBasicContext ctx) {
     public void exitIdentifierList(QueryLangParser.IdentifierListContext ctx) {
         StringPath stringPath = QPetriNet.petriNet.identifier;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream().map(node -> getStringValue(node.getText())).collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, buildStringPredicateInList(stringPath, stringList, not));
     }
@@ -557,10 +680,10 @@ public void exitIdentifierRange(QueryLangParser.IdentifierRangeContext ctx) {
         boolean not = ctx.inRangeStringComparison().NOT() != null;
         boolean leftEndpointOpen = ctx.inRangeStringComparison().stringRange().leftEndpoint.getText().equals(LEFT_OPEN_ENDPOINT);
         boolean rightEndpointOpen = ctx.inRangeStringComparison().stringRange().rightEndpoint.getText().equals(RIGHT_OPEN_ENDPOINT);
-        String leftString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(0).getText());
-        String rightString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(1).getText());
+        Pair<String, String> leftAndRightStrings = handleInRangeStringComparison(ctx.inRangeStringComparison().stringRange());
 
-        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftString, leftEndpointOpen, rightString, rightEndpointOpen, not));
+        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftAndRightStrings.getFirst(), leftEndpointOpen,
+                leftAndRightStrings.getSecond(), rightEndpointOpen, not));
     }
 
     @Override
@@ -702,7 +825,7 @@ public void exitProcessIdBasic(QueryLangParser.ProcessIdBasicContext ctx) {
         StringPath stringPath = QTask.task.processId;
         Token op = ctx.stringComparison().op;
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, buildStringPredicate(stringPath, op.getType(), string, not));
     }
@@ -711,9 +834,7 @@ public void exitProcessIdBasic(QueryLangParser.ProcessIdBasicContext ctx) {
     public void exitProcessIdList(QueryLangParser.ProcessIdListContext ctx) {
         StringPath stringPath = QTask.task.processId;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream()
-                .map(node -> getStringValue(node.getText()))
-                .collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, buildStringPredicateInList(stringPath, stringList, not));
     }
@@ -723,7 +844,7 @@ public void exitProcessIdObjIdBasic(QueryLangParser.ProcessIdObjIdBasicContext c
         QObjectId qObjectId = QCase.case$.petriNetObjectId;
         Token op = ctx.objectIdComparison().op;
         boolean not = ctx.objectIdComparison().NOT() != null;
-        ObjectId objectId = getObjectIdValue(ctx.objectIdComparison().STRING().getText());
+        ObjectId objectId = handleObjectIdComparisonWithPlaceholders(ctx.objectIdComparison());
 
         setMongoQuery(ctx, buildObjectIdPredicate(qObjectId, op.getType(), objectId, not));
         setElasticQuery(ctx, buildElasticQuery("processId", op.getType(), objectId.toString(), not));
@@ -733,12 +854,8 @@ public void exitProcessIdObjIdBasic(QueryLangParser.ProcessIdObjIdBasicContext c
     public void exitProcessIdObjIdList(QueryLangParser.ProcessIdObjIdListContext ctx) {
         QObjectId qObjectId = QCase.case$.petriNetObjectId;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<ObjectId> objectIdList = ctx.inListStringComparison().stringList().STRING().stream()
-                .map(node -> getObjectIdValue(node.getText()))
-                .collect(Collectors.toList());
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream()
-                .map(node -> getStringValue(node.getText()))
-                .collect(Collectors.toList());
+        List<ObjectId> objectIdList = handleObjectIdListComparison(ctx.inListStringComparison().stringList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, buildObjectIdPredicateInList(qObjectId, objectIdList, not));
         setElasticQuery(ctx, buildElasticQueryInList("processId", stringList, not));
@@ -749,7 +866,7 @@ public void exitProcessIdentifierBasic(QueryLangParser.ProcessIdentifierBasicCon
         StringPath stringPath = QCase.case$.processIdentifier;
         Token op = ctx.stringComparison().op;
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, buildStringPredicate(stringPath, op.getType(), string, not));
         setElasticQuery(ctx, buildElasticQuery("processIdentifier", op.getType(), string, not));
@@ -759,7 +876,7 @@ public void exitProcessIdentifierBasic(QueryLangParser.ProcessIdentifierBasicCon
     public void exitProcessIdentifierList(QueryLangParser.ProcessIdentifierListContext ctx) {
         StringPath stringPath = QCase.case$.processIdentifier;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream().map(node -> getStringValue(node.getText())).collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, buildStringPredicateInList(stringPath, stringList, not));
         setElasticQuery(ctx, buildElasticQueryInList("processIdentifier", stringList, not));
@@ -771,11 +888,12 @@ public void exitProcessIdentifierRange(QueryLangParser.ProcessIdentifierRangeCon
         boolean not = ctx.inRangeStringComparison().NOT() != null;
         boolean leftEndpointOpen = ctx.inRangeStringComparison().stringRange().leftEndpoint.getText().equals(LEFT_OPEN_ENDPOINT);
         boolean rightEndpointOpen = ctx.inRangeStringComparison().stringRange().rightEndpoint.getText().equals(RIGHT_OPEN_ENDPOINT);
-        String leftString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(0).getText());
-        String rightString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(1).getText());
+        Pair<String, String> leftAndRightStrings = handleInRangeStringComparison(ctx.inRangeStringComparison().stringRange());
 
-        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftString, leftEndpointOpen, rightString, rightEndpointOpen, not));
-        setElasticQuery(ctx, buildElasticQueryInRange("processIdentifier", leftString, leftEndpointOpen, rightString, rightEndpointOpen, not));
+        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftAndRightStrings.getFirst(), leftEndpointOpen,
+                leftAndRightStrings.getSecond(), rightEndpointOpen, not));
+        setElasticQuery(ctx, buildElasticQueryInRange("processIdentifier", leftAndRightStrings.getFirst(),
+                leftEndpointOpen, leftAndRightStrings.getSecond(), rightEndpointOpen, not));
     }
 
     @Override
@@ -783,7 +901,7 @@ public void exitAuthorBasic(QueryLangParser.AuthorBasicContext ctx) {
         StringPath stringPath = QCase.case$.author.id;
         Token op = ctx.stringComparison().op;
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, buildStringPredicate(stringPath, op.getType(), string, not));
         setElasticQuery(ctx, buildElasticQuery("author", op.getType(), string, not));
@@ -793,9 +911,7 @@ public void exitAuthorBasic(QueryLangParser.AuthorBasicContext ctx) {
     public void exitAuthorList(QueryLangParser.AuthorListContext ctx) {
         StringPath stringPath = QCase.case$.author.id;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream()
-                .map(node -> getStringValue(node.getText()))
-                .collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, buildStringPredicateInList(stringPath, stringList, not));
         setElasticQuery(ctx, buildElasticQueryInList("author", stringList, not));
@@ -806,7 +922,7 @@ public void exitTransitionIdBasic(QueryLangParser.TransitionIdBasicContext ctx)
         StringPath stringPath = QTask.task.transitionId;
         Token op = ctx.stringComparison().op;
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, buildStringPredicate(stringPath, op.getType(), string, not));
     }
@@ -815,7 +931,7 @@ public void exitTransitionIdBasic(QueryLangParser.TransitionIdBasicContext ctx)
     public void exitTransitionIdList(QueryLangParser.TransitionIdListContext ctx) {
         StringPath stringPath = QTask.task.transitionId;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream().map(node -> getStringValue(node.getText())).collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, buildStringPredicateInList(stringPath, stringList, not));
     }
@@ -826,10 +942,10 @@ public void exitTransitionIdRange(QueryLangParser.TransitionIdRangeContext ctx)
         boolean not = ctx.inRangeStringComparison().NOT() != null;
         boolean leftEndpointOpen = ctx.inRangeStringComparison().stringRange().leftEndpoint.getText().equals(LEFT_OPEN_ENDPOINT);
         boolean rightEndpointOpen = ctx.inRangeStringComparison().stringRange().rightEndpoint.getText().equals(RIGHT_OPEN_ENDPOINT);
-        String leftString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(0).getText());
-        String rightString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(1).getText());
+        Pair<String, String> leftAndRightStrings = handleInRangeStringComparison(ctx.inRangeStringComparison().stringRange());
 
-        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftString, leftEndpointOpen, rightString, rightEndpointOpen, not));
+        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftAndRightStrings.getFirst(), leftEndpointOpen,
+                leftAndRightStrings.getSecond(), rightEndpointOpen, not));
     }
 
     @Override
@@ -850,7 +966,7 @@ public void exitUserIdBasic(QueryLangParser.UserIdBasicContext ctx) {
         StringPath stringPath = QTask.task.userId;
         Token op = ctx.stringComparison().op;
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, buildStringPredicate(stringPath, op.getType(), string, not));
     }
@@ -859,9 +975,7 @@ public void exitUserIdBasic(QueryLangParser.UserIdBasicContext ctx) {
     public void exitUserIdList(QueryLangParser.UserIdListContext ctx) {
         StringPath stringPath = QTask.task.userId;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream()
-                .map(node -> getStringValue(node.getText()))
-                .collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, buildStringPredicateInList(stringPath, stringList, not));
     }
@@ -871,7 +985,7 @@ public void exitCaseIdBasic(QueryLangParser.CaseIdBasicContext ctx) {
         StringPath stringPath = QTask.task.caseId;
         Token op = ctx.stringComparison().op;
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, buildStringPredicate(stringPath, op.getType(), string, not));
     }
@@ -880,9 +994,7 @@ public void exitCaseIdBasic(QueryLangParser.CaseIdBasicContext ctx) {
     public void exitCaseIdList(QueryLangParser.CaseIdListContext ctx) {
         StringPath stringPath = QTask.task.caseId;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream()
-                .map(node -> getStringValue(node.getText()))
-                .collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, buildStringPredicateInList(stringPath, stringList, not));
     }
@@ -1006,7 +1118,7 @@ public void exitNameBasic(QueryLangParser.NameBasicContext ctx) {
         StringPath stringPath = QUser.user.name;
         Token op = ctx.stringComparison().op;
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, buildStringPredicate(stringPath, op.getType(), string, not));
     }
@@ -1015,7 +1127,7 @@ public void exitNameBasic(QueryLangParser.NameBasicContext ctx) {
     public void exitNameList(QueryLangParser.NameListContext ctx) {
         StringPath stringPath = QUser.user.name;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream().map(node -> getStringValue(node.getText())).collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, buildStringPredicateInList(stringPath, stringList, not));
     }
@@ -1026,10 +1138,10 @@ public void exitNameRange(QueryLangParser.NameRangeContext ctx) {
         boolean not = ctx.inRangeStringComparison().NOT() != null;
         boolean leftEndpointOpen = ctx.inRangeStringComparison().stringRange().leftEndpoint.getText().equals(LEFT_OPEN_ENDPOINT);
         boolean rightEndpointOpen = ctx.inRangeStringComparison().stringRange().rightEndpoint.getText().equals(RIGHT_OPEN_ENDPOINT);
-        String leftString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(0).getText());
-        String rightString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(1).getText());
+        Pair<String, String> leftAndRightStrings = handleInRangeStringComparison(ctx.inRangeStringComparison().stringRange());
 
-        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftString, leftEndpointOpen, rightString, rightEndpointOpen, not));
+        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftAndRightStrings.getFirst(), leftEndpointOpen,
+                leftAndRightStrings.getSecond(), rightEndpointOpen, not));
     }
 
     @Override
@@ -1037,7 +1149,7 @@ public void exitSurnameBasic(QueryLangParser.SurnameBasicContext ctx) {
         StringPath stringPath = QUser.user.surname;
         Token op = ctx.stringComparison().op;
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, buildStringPredicate(stringPath, op.getType(), string, not));
     }
@@ -1046,7 +1158,7 @@ public void exitSurnameBasic(QueryLangParser.SurnameBasicContext ctx) {
     public void exitSurnameList(QueryLangParser.SurnameListContext ctx) {
         StringPath stringPath = QUser.user.surname;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream().map(node -> getStringValue(node.getText())).collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, buildStringPredicateInList(stringPath, stringList, not));
     }
@@ -1057,10 +1169,10 @@ public void exitSurnameRange(QueryLangParser.SurnameRangeContext ctx) {
         boolean not = ctx.inRangeStringComparison().NOT() != null;
         boolean leftEndpointOpen = ctx.inRangeStringComparison().stringRange().leftEndpoint.getText().equals(LEFT_OPEN_ENDPOINT);
         boolean rightEndpointOpen = ctx.inRangeStringComparison().stringRange().rightEndpoint.getText().equals(RIGHT_OPEN_ENDPOINT);
-        String leftString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(0).getText());
-        String rightString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(1).getText());
+        Pair<String, String> leftAndRightStrings = handleInRangeStringComparison(ctx.inRangeStringComparison().stringRange());
 
-        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftString, leftEndpointOpen, rightString, rightEndpointOpen, not));
+        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftAndRightStrings.getFirst(), leftEndpointOpen,
+                leftAndRightStrings.getSecond(), rightEndpointOpen, not));
     }
 
     @Override
@@ -1068,7 +1180,7 @@ public void exitEmailBasic(QueryLangParser.EmailBasicContext ctx) {
         StringPath stringPath = QUser.user.email;
         Token op = ctx.stringComparison().op;
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, buildStringPredicate(stringPath, op.getType(), string, not));
     }
@@ -1077,7 +1189,7 @@ public void exitEmailBasic(QueryLangParser.EmailBasicContext ctx) {
     public void exitEmailList(QueryLangParser.EmailListContext ctx) {
         StringPath stringPath = QUser.user.email;
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream().map(node -> getStringValue(node.getText())).collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, buildStringPredicateInList(stringPath, stringList, not));
     }
@@ -1088,10 +1200,10 @@ public void exitEmailRange(QueryLangParser.EmailRangeContext ctx) {
         boolean not = ctx.inRangeStringComparison().NOT() != null;
         boolean leftEndpointOpen = ctx.inRangeStringComparison().stringRange().leftEndpoint.getText().equals(LEFT_OPEN_ENDPOINT);
         boolean rightEndpointOpen = ctx.inRangeStringComparison().stringRange().rightEndpoint.getText().equals(RIGHT_OPEN_ENDPOINT);
-        String leftString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(0).getText());
-        String rightString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(1).getText());
+        Pair<String, String> leftAndRightStrings = handleInRangeStringComparison(ctx.inRangeStringComparison().stringRange());
 
-        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftString, leftEndpointOpen, rightString, rightEndpointOpen, not));
+        setMongoQuery(ctx, buildStringPredicateInRange(stringPath, leftAndRightStrings.getFirst(), leftEndpointOpen,
+                leftAndRightStrings.getSecond(), rightEndpointOpen, not));
     }
 
     @Override
@@ -1100,7 +1212,7 @@ public void exitDataString(QueryLangParser.DataStringContext ctx) {
         Token op = ctx.stringComparison().op;
         checkOp(ComparisonType.STRING, op);
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, null);
         setElasticQuery(ctx, buildElasticQuery("dataSet." + fieldId + ".textValue", op.getType(), string, not));
@@ -1111,7 +1223,7 @@ public void exitDataString(QueryLangParser.DataStringContext ctx) {
     public void exitDataStringList(QueryLangParser.DataStringListContext ctx) {
         String fieldId = ctx.dataValue().fieldId.getText();
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream().map(node -> getStringValue(node.getText())).collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, null);
         setElasticQuery(ctx, buildElasticQueryInList("dataSet." + fieldId + ".textValue", stringList, not));
@@ -1124,11 +1236,11 @@ public void exitDataStringRange(QueryLangParser.DataStringRangeContext ctx) {
         boolean not = ctx.inRangeStringComparison().NOT() != null;
         boolean leftEndpointOpen = ctx.inRangeStringComparison().stringRange().leftEndpoint.getText().equals(LEFT_OPEN_ENDPOINT);
         boolean rightEndpointOpen = ctx.inRangeStringComparison().stringRange().rightEndpoint.getText().equals(RIGHT_OPEN_ENDPOINT);
-        String leftString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(0).getText());
-        String rightString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(1).getText());
+        Pair<String, String> leftAndRightStrings = handleInRangeStringComparison(ctx.inRangeStringComparison().stringRange());
 
         setMongoQuery(ctx, null);
-        setElasticQuery(ctx, buildElasticQueryInRange("dataSet." + fieldId + ".textValue", leftString, leftEndpointOpen, rightString, rightEndpointOpen, not));
+        setElasticQuery(ctx, buildElasticQueryInRange("dataSet." + fieldId + ".textValue", leftAndRightStrings.getFirst(),
+                leftEndpointOpen, leftAndRightStrings.getSecond(), rightEndpointOpen, not));
         this.searchWithElastic = true;
     }
 
@@ -1254,7 +1366,7 @@ public void exitDataBoolean(QueryLangParser.DataBooleanContext ctx) {
         Token op = ctx.booleanComparison().op;
         checkOp(ComparisonType.BOOLEAN, op);
         boolean not = ctx.booleanComparison().NOT() != null;
-        String booleanValue = ctx.booleanComparison().BOOLEAN().getText();
+        String booleanValue = handleBooleanComparison(ctx.booleanComparison());
 
         setMongoQuery(ctx, null);
         setElasticQuery(ctx, buildElasticQuery("dataSet." + fieldId + ".booleanValue", op.getType(), booleanValue, not));
@@ -1267,7 +1379,7 @@ public void exitDataOptionsBasic(QueryLangParser.DataOptionsBasicContext ctx) {
         Token op = ctx.stringComparison().op;
         checkOp(ComparisonType.STRING, op);
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, null);
         setElasticQuery(ctx, buildElasticQuery("dataSet." + fieldId + ".options", op.getType(), string, not));
@@ -1278,7 +1390,7 @@ public void exitDataOptionsBasic(QueryLangParser.DataOptionsBasicContext ctx) {
     public void exitDataOptionsList(QueryLangParser.DataOptionsListContext ctx) {
         String fieldId = ctx.dataOptions().fieldId.getText();
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream().map(node -> getStringValue(node.getText())).collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, null);
         setElasticQuery(ctx, buildElasticQueryInList("dataSet." + fieldId + ".options", stringList, not));
@@ -1291,11 +1403,11 @@ public void exitDataOptionsRange(QueryLangParser.DataOptionsRangeContext ctx) {
         boolean not = ctx.inRangeStringComparison().NOT() != null;
         boolean leftEndpointOpen = ctx.inRangeStringComparison().stringRange().leftEndpoint.getText().equals(LEFT_OPEN_ENDPOINT);
         boolean rightEndpointOpen = ctx.inRangeStringComparison().stringRange().rightEndpoint.getText().equals(RIGHT_OPEN_ENDPOINT);
-        String leftString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(0).getText());
-        String rightString = getStringValue(ctx.inRangeStringComparison().stringRange().STRING(1).getText());
+        Pair<String, String> leftAndRightStrings = handleInRangeStringComparison(ctx.inRangeStringComparison().stringRange());
 
         setMongoQuery(ctx, null);
-        setElasticQuery(ctx, buildElasticQueryInRange("dataSet." + fieldId + ".options", leftString, leftEndpointOpen, rightString, rightEndpointOpen, not));
+        setElasticQuery(ctx, buildElasticQueryInRange("dataSet." + fieldId + ".options", leftAndRightStrings.getFirst(),
+                leftEndpointOpen, leftAndRightStrings.getSecond(), rightEndpointOpen, not));
         this.searchWithElastic = true;
     }
 
@@ -1369,7 +1481,7 @@ public void exitTasksUserIdBasic(QueryLangParser.TasksUserIdBasicContext ctx) {
         Token op = ctx.stringComparison().op;
         checkOp(ComparisonType.STRING, op);
         boolean not = ctx.stringComparison().NOT() != null;
-        String string = getStringValue(ctx.stringComparison().STRING().getText());
+        String string = handleStringComparisonWithPlaceholders(ctx.stringComparison());
 
         setMongoQuery(ctx, null);
         setElasticQuery(ctx, buildElasticQuery("tasks." + taskId + ".userId", op.getType(), string, not));
@@ -1380,9 +1492,7 @@ public void exitTasksUserIdBasic(QueryLangParser.TasksUserIdBasicContext ctx) {
     public void exitTasksUserIdList(QueryLangParser.TasksUserIdListContext ctx) {
         String taskId = ctx.tasksUserId().taskId.getText();
         boolean not = ctx.inListStringComparison().NOT() != null;
-        List<String> stringList = ctx.inListStringComparison().stringList().STRING().stream()
-                .map(node -> getStringValue(node.getText()))
-                .collect(Collectors.toList());
+        List<String> stringList = handleStringListComparison(ctx.inListStringComparison().stringList());
 
         setMongoQuery(ctx, null);
         setElasticQuery(ctx, buildElasticQueryInList("tasks." + taskId + ".userId", stringList, not));
diff --git a/src/main/java/com/netgrif/application/engine/pfql/service/utils/SearchUtils.java b/src/main/java/com/netgrif/application/engine/pfql/service/utils/SearchUtils.java
index a9af2f6a57..4a4f5ddf04 100644
--- a/src/main/java/com/netgrif/application/engine/pfql/service/utils/SearchUtils.java
+++ b/src/main/java/com/netgrif/application/engine/pfql/service/utils/SearchUtils.java
@@ -1,5 +1,7 @@
 package com.netgrif.application.engine.pfql.service.utils;
 
+import com.netgrif.application.engine.auth.service.interfaces.IUserService;
+import com.netgrif.application.engine.configuration.ApplicationContextProvider;
 import com.netgrif.application.engine.petrinet.domain.QPetriNet;
 import com.netgrif.application.engine.petrinet.domain.version.QVersion;
 import com.netgrif.application.engine.petrinet.domain.version.Version;
@@ -161,7 +163,8 @@ private static QueryLangBaseListener evaluateQueryInternal(String input, boolean
             return explainQueryInternal(walker, query, errorListener);
         }
 
-        QueryLangEvaluator evaluator = new QueryLangEvaluator();
+        IUserService userService = (IUserService) ApplicationContextProvider.getBean(IUserService.class);
+        QueryLangEvaluator evaluator = new QueryLangEvaluator(userService);
         walker.walk(evaluator, query);
 
         return evaluator;
diff --git a/src/test/java/com/netgrif/application/engine/pfql/QueryLangTest.java b/src/test/java/com/netgrif/application/engine/pfql/QueryLangTest.java
index 929f7e242a..451d7334b1 100644
--- a/src/test/java/com/netgrif/application/engine/pfql/QueryLangTest.java
+++ b/src/test/java/com/netgrif/application/engine/pfql/QueryLangTest.java
@@ -1,8 +1,11 @@
 package com.netgrif.application.engine.pfql;
 
 import com.netgrif.application.engine.TestHelper;
+import com.netgrif.application.engine.auth.domain.IUser;
+import com.netgrif.application.engine.auth.domain.LoggedUser;
 import com.netgrif.application.engine.auth.domain.QUser;
 import com.netgrif.application.engine.auth.domain.User;
+import com.netgrif.application.engine.auth.service.interfaces.IUserService;
 import com.netgrif.application.engine.petrinet.domain.PetriNet;
 import com.netgrif.application.engine.petrinet.domain.QPetriNet;
 import com.netgrif.application.engine.petrinet.domain.version.Version;
@@ -19,7 +22,6 @@
 import com.querydsl.core.types.dsl.StringPath;
 import org.bson.Document;
 import org.bson.types.ObjectId;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -61,10 +63,12 @@ public class QueryLangTest {
     @Autowired
     private TestHelper testHelper;
 
+    @Autowired
+    private IUserService userService;
+
     @Test
     @SuppressWarnings("unchecked")
-    @Disabled
-    public void testSearchService() {
+    public void testSearchService() throws InterruptedException {
         testHelper.truncateDbs();
 
         Optional<PetriNet> optionalPetriNet = helper.createNet("/pfql.xml");
@@ -81,6 +85,8 @@ public void testSearchService() {
             helper.createCase(String.format("Test %02d", i), process, params);
         }
 
+        Thread.sleep(2000);
+
         Object cases = searchService.search("cases: processIdentifier eq 'query_test' page 1 size 5 sort by title desc");
         assertNotNull(cases);
         assertEquals(PageImpl.class, cases.getClass());
@@ -107,6 +113,9 @@ public void testSearchService() {
 
         cases = searchService.search("cases: processIdentifier eq 'query_test'    and data.boolean_0.value == true and data.text_0.value != '4'");
         assertEquals(4, ((Page<Case>) cases).getTotalElements());
+
+        cases = searchService.search("cases: processIdentifier eq 'query_test' and author eq loggedUser.id");
+        assertEquals(10, ((Page<Case>) cases).getTotalElements());
     }
 
     @Test
@@ -238,6 +247,12 @@ public void testComplexMongodbProcessQuery() {
 
         compareMongoQueries(mongoDbUtils, actual, expected);
 
+        IUser systemUser = userService.getSystem();
+        actual = evaluateQuery("process: id neq loggedUser.id").getFullMongoQuery();
+        expected = QPetriNet.petriNet._id.eq(new ObjectId(systemUser.getStringId())).not();
+
+        compareMongoQueries(mongoDbUtils, actual, expected);
+
         // and comparison
         actual = evaluateQuery(String.format("process: id eq '%s' and title eq 'test'", GENERIC_OBJECT_ID)).getFullMongoQuery();
         expected = QPetriNet.petriNet._id.eq(GENERIC_OBJECT_ID).and(QPetriNet.petriNet.title.defaultValue.eq("test"));
@@ -304,7 +319,20 @@ public void testSimpleMongodbCaseQuery() {
 
         compareMongoQueries(mongoDbUtils, actual, expected);
 
-        actual = evaluateQuery(String.format("case: id in ('%s', '%s')", GENERIC_OBJECT_ID, GENERIC_OBJECT_ID)).getFullMongoQuery();
+        LoggedUser systemUser = userService.getSystem().transformToLoggedUser();
+        actual = evaluateQuery("case: id neq loggedUser.id").getFullMongoQuery();
+        expected = QCase.case$._id.eq(new ObjectId(systemUser.getId())).not();
+
+        compareMongoQueries(mongoDbUtils, actual, expected);
+
+        actual = evaluateQuery(String.format("case: id in ('%s', '%s', loggedUser.id, loggedUser.username, loggedUser.fullName)",
+                GENERIC_OBJECT_ID, GENERIC_OBJECT_ID)).getFullMongoQuery();
+        expected = QCase.case$._id.in(GENERIC_OBJECT_ID, GENERIC_OBJECT_ID, new ObjectId(systemUser.getId()));
+
+        compareMongoQueries(mongoDbUtils, actual, expected);
+
+        actual = evaluateQuery(String.format("case: id in ('%s', '%s', loggedUser.username, loggedUser.fullName)",
+                GENERIC_OBJECT_ID, GENERIC_OBJECT_ID)).getFullMongoQuery();
         expected = QCase.case$._id.in(GENERIC_OBJECT_ID, GENERIC_OBJECT_ID);
 
         compareMongoQueries(mongoDbUtils, actual, expected);
@@ -335,16 +363,37 @@ public void testSimpleMongodbCaseQuery() {
 
         compareMongoQueries(mongoDbUtils, actual, expected);
 
+        actual = evaluateQuery("case: author eq loggedUser.id").getFullMongoQuery();
+        expected = QCase.case$.author.id.eq(systemUser.getId());
+
+        compareMongoQueries(mongoDbUtils, actual, expected);
+
         actual = evaluateQuery("case: author contains 'test'").getFullMongoQuery();
         expected = QCase.case$.author.id.contains("test");
 
         compareMongoQueries(mongoDbUtils, actual, expected);
 
-        actual = evaluateQuery("case: author in ('test', 'test1')").getFullMongoQuery();
-        expected = QCase.case$.author.id.in("test", "test1");
+        actual = evaluateQuery("case: author in ('test', 'test1', loggedUser.id, loggedUser.username, loggedUser.fullName)").getFullMongoQuery();
+        expected = QCase.case$.author.id.in("test", "test1", systemUser.getId(), systemUser.getUsername(), systemUser.getFullName());
 
         compareMongoQueries(mongoDbUtils, actual, expected);
 
+        actual = evaluateQuery("cases: title in ('test1' : loggedUser.username)").getFullMongoQuery();
+        expected = QCase.case$.title.gt("test1").and(QCase.case$.title.lt(systemUser.getUsername()));
+
+        compareMongoQueries(mongoDbUtils, actual, expected);
+
+        actual = evaluateQuery("cases: title in (loggedUser.username : 'test1')").getFullMongoQuery();
+        expected = QCase.case$.title.gt(systemUser.getUsername()).and(QCase.case$.title.lt("test1"));
+
+        compareMongoQueries(mongoDbUtils, actual, expected);
+
+        actual = evaluateQuery("cases: title in (loggedUser.username : loggedUser.fullName)").getFullMongoQuery();
+        expected = QCase.case$.title.gt(systemUser.getUsername()).and(QCase.case$.title.lt(systemUser.getFullName()));
+
+        compareMongoQueries(mongoDbUtils, actual, expected);
+
+
         // only available for elastic query
         // places comparison
         actual = evaluateQuery("case: places.p1.marking eq 1").getFullMongoQuery();
@@ -459,8 +508,11 @@ public void testComplexMongodbCaseQuery() {
         compareMongoQueries(mongoDbUtils, actual, expected);
 
         // parenthesis comparison
-        actual = evaluateQuery(String.format("case: id eq '%s' and (title eq 'test' or title eq 'test1')", GENERIC_OBJECT_ID)).getFullMongoQuery();
-        expected = QCase.case$._id.eq(GENERIC_OBJECT_ID).and(QCase.case$.title.eq("test").or(QCase.case$.title.eq("test1")));
+        LoggedUser systemUser = userService.getSystem().transformToLoggedUser();
+        actual = evaluateQuery(String.format("case: id eq '%s' and (title eq 'test' or title eq 'test1' or title eq loggedUser.username)",
+                GENERIC_OBJECT_ID)).getFullMongoQuery();
+        expected = QCase.case$._id.eq(GENERIC_OBJECT_ID)
+                .and(QCase.case$.title.eq("test").or(QCase.case$.title.eq("test1")).or(QCase.case$.title.eq(systemUser.getUsername())));
 
         compareMongoQueries(mongoDbUtils, actual, expected);
 
@@ -489,8 +541,9 @@ public void testSimpleMongodbTaskQuery() {
 
         compareMongoQueries(mongoDbUtils, actual, expected);
 
-        actual = evaluateQuery(String.format("task: id in ('%s', '%s')", GENERIC_OBJECT_ID, GENERIC_OBJECT_ID)).getFullMongoQuery();
-        expected = QTask.task._id.in(GENERIC_OBJECT_ID, GENERIC_OBJECT_ID);
+        LoggedUser systemUser = userService.getSystem().transformToLoggedUser();
+        actual = evaluateQuery(String.format("task: id in ('%s', '%s', loggedUser.id)", GENERIC_OBJECT_ID, GENERIC_OBJECT_ID)).getFullMongoQuery();
+        expected = QTask.task._id.in(GENERIC_OBJECT_ID, GENERIC_OBJECT_ID, new ObjectId(systemUser.getId()));
 
         compareMongoQueries(mongoDbUtils, actual, expected);
 
@@ -654,8 +707,14 @@ public void testSimpleMongodbUserQuery() {
 
         compareMongoQueries(mongoDbUtils, actual, expected);
 
-        actual = evaluateQuery(String.format("user: id in ('%s', '%s')", GENERIC_OBJECT_ID, GENERIC_OBJECT_ID)).getFullMongoQuery();
-        expected = QUser.user._id.in(GENERIC_OBJECT_ID, GENERIC_OBJECT_ID);
+        LoggedUser systemUser = userService.getSystem().transformToLoggedUser();
+        actual = evaluateQuery("user: id eq loggedUser.id").getFullMongoQuery();
+        expected = QUser.user._id.eq(new ObjectId(systemUser.getId()));
+
+        compareMongoQueries(mongoDbUtils, actual, expected);
+
+        actual = evaluateQuery(String.format("user: id in ('%s', '%s', loggEduser.id)", GENERIC_OBJECT_ID, GENERIC_OBJECT_ID)).getFullMongoQuery();
+        expected = QUser.user._id.in(GENERIC_OBJECT_ID, GENERIC_OBJECT_ID, new ObjectId(systemUser.getId()));
 
         compareMongoQueries(mongoDbUtils, actual, expected);
 
@@ -690,6 +749,12 @@ public void testComplexMongodbUserQuery() {
 
         compareMongoQueries(mongoDbUtils, actual, expected);
 
+        LoggedUser systemUser = userService.getSystem().transformToLoggedUser();
+        actual = evaluateQuery(String.format("user: id eq '%s' and email eq loggedUser.username", GENERIC_OBJECT_ID)).getFullMongoQuery();
+        expected = QUser.user._id.eq(GENERIC_OBJECT_ID).and(QUser.user.email.eq(systemUser.getUsername()));
+
+        compareMongoQueries(mongoDbUtils, actual, expected);
+
         // and not comparison
         actual = evaluateQuery(String.format("user: id eq '%s' and email not eq 'test'", GENERIC_OBJECT_ID)).getFullMongoQuery();
         expected = QUser.user._id.eq(GENERIC_OBJECT_ID).and(QUser.user.email.eq("test").not());
@@ -865,7 +930,18 @@ public void testSimpleElasticCaseQuery() {
         expected = String.format("stringId:%s", GENERIC_OBJECT_ID);
         assertEquals(expected, actual);
 
-        actual = evaluateQuery(String.format("case: id in ('%s', '%s')", GENERIC_OBJECT_ID, GENERIC_OBJECT_ID)).getFullElasticQuery();
+        LoggedUser systemUser = userService.getSystem().transformToLoggedUser();
+        actual = evaluateQuery("case: id neq loggedUser.id").getFullElasticQuery();
+        expected = String.format("NOT stringId:%s", systemUser.getId());
+        assertEquals(expected, actual);
+
+        actual = evaluateQuery(String.format("case: id in ('%s', '%s', loggedUser.id, loggedUser.username, loggedUser.fullname)",
+                GENERIC_OBJECT_ID, GENERIC_OBJECT_ID)).getFullElasticQuery();
+        expected = String.format("stringId:(%s OR %s OR %s)", GENERIC_OBJECT_ID, GENERIC_OBJECT_ID, systemUser.getId());
+        assertEquals(expected, actual);
+
+        actual = evaluateQuery(String.format("case: id in ('%s', '%s', loggedUser.username, loggedUser.fullname)",
+                GENERIC_OBJECT_ID, GENERIC_OBJECT_ID)).getFullElasticQuery();
         expected = String.format("stringId:(%s OR %s)", GENERIC_OBJECT_ID, GENERIC_OBJECT_ID);
         assertEquals(expected, actual);
 
@@ -892,12 +968,21 @@ public void testSimpleElasticCaseQuery() {
         expected = "author:test";
         assertEquals(expected, actual);
 
+        actual = evaluateQuery("case: author eq loggedUser.id").getFullElasticQuery();
+        expected = String.format("author:%s", systemUser.getId());
+        assertEquals(expected, actual);
+
         actual = evaluateQuery("case: author contains 'test'").getFullElasticQuery();
         expected = "author:*test*";
         assertEquals(expected, actual);
 
-        actual = evaluateQuery(String.format("case: author in ('%s', '%s')", GENERIC_OBJECT_ID, GENERIC_OBJECT_ID)).getFullElasticQuery();
-        expected = String.format("author:(%s OR %s)", GENERIC_OBJECT_ID, GENERIC_OBJECT_ID);
+        actual = evaluateQuery("case: author contains loggedUser.id").getFullElasticQuery();
+        expected = String.format("author:*%s*", systemUser.getId());
+        assertEquals(expected, actual);
+
+        actual = evaluateQuery(String.format("case: author in ('%s', '%s', loggedUser.id)", GENERIC_OBJECT_ID,
+                GENERIC_OBJECT_ID)).getFullElasticQuery();
+        expected = String.format("author:(%s OR %s OR %s)", GENERIC_OBJECT_ID, GENERIC_OBJECT_ID, new ObjectId(systemUser.getId()));
         assertEquals(expected, actual);
 
         // places comparison
@@ -936,12 +1021,31 @@ public void testSimpleElasticCaseQuery() {
         expected = "dataSet.field1.booleanValue:true";
         assertEquals(expected, actual);
 
+        actual = evaluateQuery("case: data.field1.value eq loggedUser.anonymous").getFullElasticQuery();
+        expected = "dataSet.field1.booleanValue:false";
+        assertEquals(expected, actual);
+
         actual = evaluateQuery("case: data.field1.value eq false").getFullElasticQuery();
         expected = "dataSet.field1.booleanValue:false";
         assertEquals(expected, actual);
 
         // data options comparison
         checkStringComparisonElastic("case", "data.field1.options", "dataSet.field1.options");
+
+        actual = evaluateQuery("cases: title in ('test1' : loggedUser.username)").getFullElasticQuery();
+        expected = String.format("(title:>test1 AND title:<%s)", systemUser.getUsername());
+
+        assertEquals(expected, actual);
+
+        actual = evaluateQuery("cases: title in (loggedUser.username : 'test1')").getFullElasticQuery();
+        expected = String.format("(title:>%s AND title:<test1)", systemUser.getUsername());
+
+        assertEquals(expected, actual);
+
+        actual = evaluateQuery("cases: title in (loggedUser.username : loggedUser.fullName)").getFullElasticQuery();
+        expected = String.format("(title:>%s AND title:<%s)", systemUser.getUsername(), systemUser.getFullName());
+
+        assertEquals(expected, actual);
     }
 
     @Test
@@ -1715,6 +1819,8 @@ public void testCaseQueriesFail() {
         assertThrows(IllegalArgumentException.class, () -> evaluateQuery("case email eq 'test'"));
         assertThrows(IllegalArgumentException.class, () -> evaluateQuery("case page 2"));
         assertThrows(IllegalArgumentException.class, () -> evaluateQuery("case:"));
+        assertThrows(IllegalArgumentException.class, () -> evaluateQuery("case: creationDate eq loggedUser.id"));
+        assertThrows(IllegalArgumentException.class, () -> evaluateQuery("case: processIdentifier eq loggedUser.anonymous"));
     }
 
     @Test