fix(APIM-531): fix swagger regex field

src/helpers/regex.helper.ts

@@ -1,4 +1,4 @@
 // This helper function is used to convert the regex pattern to a string so that it can be used in the swagger documentation.
 export const regexToString = (regex: RegExp): string => {
-  return regex.toString().replace(/^\/|\/$/g, '');
+  return regex.source;
 };