I'd like to have the ability to test the regex in a marc modification template from the add/edit action screen. Something like what we have over in classsources.pl for creating and testing a regex splitting rule -- a place to put in some sample text to apply your regex to for matching/substitution to make sure it works as intended. As is, you need to save the template and then test it in either batch record mod or as part of staging a file for import, which is pretty labor intensive when troubleshooting some regex.
This would be very handy.
+1