Regular expression in allowed url

Hello all, Hi I have added a URL with regular expression to the allowed URL. Unfortunately I still get displayed as illegal Ural when calling pages.

\/prweb\/IAC\/.{20,50}\/!TEST\/\$STANDARD

Call URL /prweb/IAC/S8ossssswUJa7iJFLLLndCy2E8wfw[[*/!TEST/$STANDARD

At the RegExp Validator I get a match displayed How do I enter this correctly in Allowed URL?

Thanks for you help Udo