This is a fantastically useful tool. A couple of minor UI improvements in the rxrx command line tool would make it even better
* command line history to make it easier to fix buggy regexps. luckily, rlwrap works with rxrx
* documenting all of the keyboard sequences in the online help
Regexp::Debugger does a great job of illustrating how the regex engine actually does matching. It can help visualize the execution, helping programmers see and fix inefficiencies. For programmers new to regex, it's a great learning tool too.
Hundreds of kudos to Damian!
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