diff --git a/main/plugins/org.talend.librariesmanager/resources/java/routines/system/StringUtils.java b/main/plugins/org.talend.librariesmanager/resources/java/routines/system/StringUtils.java
index 9866debc78..f9e20f901d 100644
--- a/main/plugins/org.talend.librariesmanager/resources/java/routines/system/StringUtils.java
+++ b/main/plugins/org.talend.librariesmanager/resources/java/routines/system/StringUtils.java
@@ -339,7 +339,7 @@ public class StringUtils {
                 return null; // regex != null && src == null
             } else {
                 // case 3:
-                if (replacement == null) {
+                if (replacement == null || entirelyMatch) {
                     if ((caseSensitive && src.equals(search)) || (!caseSensitive && src.equalsIgnoreCase(search))) {
                         // regex != null && src != null && replacement != null, and match the whole src
                         return replacement;
@@ -348,13 +348,8 @@ public class StringUtils {
                     }
 
                 } else {
-                    // regex != null && src != null && replacement != null
-                    if (entirelyMatch) {
-                        return caseSensitive ? src.equals(search) : src.equalsIgnoreCase(search);
-                    } else {
-                        int flag = caseSensitive ? Pattern.LITERAL : Pattern.LITERAL | Pattern.CASE_INSENSITIVE;
-                        return Pattern.compile(search, flag).matcher(src).replaceAll(Matcher.quoteReplacement(replacement));
-                    }
+                    int flag = caseSensitive ? Pattern.LITERAL : Pattern.LITERAL | Pattern.CASE_INSENSITIVE;
+                    return Pattern.compile(search, flag).matcher(src).replaceAll(Matcher.quoteReplacement(replacement));
                 }
             }
         }