diff --git a/api/advent22_api/core/transformed_string.py b/api/advent22_api/core/transformed_string.py
index 3099abb..7e354c2 100644
--- a/api/advent22_api/core/transformed_string.py
+++ b/api/advent22_api/core/transformed_string.py
@@ -4,11 +4,11 @@ from random import Random
 
 from pydantic import BaseModel, field_validator
 
-_RE_WHITESPACE = re.compile(
+RE_WHITESPACE = re.compile(
     pattern=r"\s+",
     flags=re.UNICODE | re.IGNORECASE,
 )
-_RE_SPECIAL_CHARS = re.compile(
+RE_SPECIAL_CHARS = re.compile(
     pattern=r"[^a-zA-Z0-9\s]+",
     flags=re.UNICODE | re.IGNORECASE,
 )
@@ -67,14 +67,14 @@ class TransformedString(BaseModel):
             result = result.strip()
 
         elif self.whitespace is TransformedString.__Whitespace.SPACE:
-            result = _RE_WHITESPACE.sub(string=result, repl=" ")
+            result = RE_WHITESPACE.sub(string=result, repl=" ")
 
         elif self.whitespace is TransformedString.__Whitespace.REMOVE:
-            result = _RE_WHITESPACE.sub(string=result, repl="")
+            result = RE_WHITESPACE.sub(string=result, repl="")
 
         # Sonderzeichen verarbeiten
         if self.special_chars is TransformedString.__SpecialChars.REMOVE:
-            result = _RE_SPECIAL_CHARS.sub(string=result, repl="")
+            result = RE_SPECIAL_CHARS.sub(string=result, repl="")
 
         # Groß-/Kleinschreibung verarbeiten
         if self.case is TransformedString.__Case.UPPER: