diff --git a/tokenizer/src/nativeMain/kotlin/com/xebia/functional/tokenizer/regex.kt b/tokenizer/src/nativeMain/kotlin/com/xebia/functional/tokenizer/regex.kt
index edee5bee3..7d536ba5a 100644
--- a/tokenizer/src/nativeMain/kotlin/com/xebia/functional/tokenizer/regex.kt
+++ b/tokenizer/src/nativeMain/kotlin/com/xebia/functional/tokenizer/regex.kt
@@ -67,8 +67,8 @@ actual val o200k_base_regex: Regex
   get() =
     Regex(
       listOf(
-          """[^\r\n\$alphaChars]?[$upperCaseAndOtherLetters]*[$lowerCaseAndOtherLetters]+(?i:'s|'t|'re|'ve|'m|'ll|'d)?""",
-          """[^\r\n\$alphaChars]?[$upperCaseAndOtherLetters]+[$lowerCaseAndOtherLetters]*(?i:'s|'t|'re|'ve|'m|'ll|'d)?""",
+          """[^\r\n\$alphaChars]?[$upperCaseAndOtherLetters]*[$lowerCaseAndOtherLetters]+('s|'t|'re|'ve|'m|'ll|'d)?""",
+          """[^\r\n\$alphaChars]?[$upperCaseAndOtherLetters]+[$lowerCaseAndOtherLetters]*('s|'t|'re|'ve|'m|'ll|'d)?""",
           """[$decimalNumbers]{1,3}""",
           """?[^\s\$alphaChars]+[\r\n/]*""",
           """\s*[\r\n]+""",