Email validation REGEX - Alteryx returning error - HELP

Hi Folks

I am using the following regex to validate email addresses: ([\w-\.]+)@((?:[\w]+\.)+)([a-zA-Z]{2,4})

IT works fine in a regex tester, but when i put it in Alteryx using the Regex_Match in a filter it returns the following error: 

Warning: Filter (16): REGEX_MATCH: RegEx: A character range was invalid, for example [d-a] at character 5

Any help trying to debug this would be greatly appreciated. 

cheers