Hi,
If you want to check for number match in the routeOnAttribute. You can create dynamic property called for example "filenameHasNumeric" and set the value to the following expression "${filename:matches('.*\d+.*')}". You can set the routing strategy to "Route to 'matched' if all matches" to get "matched" or "unmatched" relationships. If that solves the problem please accept it as solution. Thanks