diff --git a/src/main/java/com/endava/cats/generator/simple/StringGenerator.java b/src/main/java/com/endava/cats/generator/simple/StringGenerator.java
index 7b20a8ea2..ad8988c89 100755
--- a/src/main/java/com/endava/cats/generator/simple/StringGenerator.java
+++ b/src/main/java/com/endava/cats/generator/simple/StringGenerator.java
@@ -90,6 +90,7 @@ public class StringGenerator {
     private static final org.cornutum.regexpgen.Provider REGEXPGEN_PROVIDER = Provider.forEcmaScript();
 
     private static final PrettyLogger LOGGER = PrettyLoggerFactory.getLogger(StringGenerator.class);
+    public static final String CASE_INSENSITIVE = "\\(\\?i\\)";
 
     private StringGenerator() {
         //ntd
@@ -180,6 +181,7 @@ public static String cleanPattern(String pattern) {
             pattern = StringUtils.removeEnd(pattern, "/");
         }
         pattern = pattern.replaceAll(EMPTY_PATTERN, EMPTY);
+        pattern = pattern.replaceAll(CASE_INSENSITIVE, EMPTY);
         return pattern;
     }
 
diff --git a/src/test/java/com/endava/cats/generator/simple/StringGeneratorTest.java b/src/test/java/com/endava/cats/generator/simple/StringGeneratorTest.java
index e8aa86249..06d0e94ae 100644
--- a/src/test/java/com/endava/cats/generator/simple/StringGeneratorTest.java
+++ b/src/test/java/com/endava/cats/generator/simple/StringGeneratorTest.java
@@ -128,4 +128,10 @@ void shouldGenerateWhenOrEmpty() {
         String generated = StringGenerator.generate("^$|^(?i)(http:\\/\\/|https:\\/\\/)([a-z0-9./\\-_.~+=:;%&?]+)$", 100, 100);
         Assertions.assertThat(generated).hasSize(100).matches("^(?i)(http://|https://)([a-z0-9./\\-_.~+=:;%&?]+)");
     }
+
+    @Test
+    void shouldRemoveCaseInsensitive() {
+        String generated = StringGenerator.cleanPattern("^(?i)(http:\\/\\/|https:\\/\\/)([a-z0-9./\\-_.~+=:;%&?]+)$");
+        Assertions.assertThat(generated).isEqualTo("^(http:\\/\\/|https:\\/\\/)([a-z0-9./\\-_.~+=:;%&?]+)$");
+    }
 }