Allow for more flexible string manipulation.
Current regex only supports matching inputs, so you can for example replace:
[A-Z][A-Za-z0-9_]* > SomeText.
However supporting groups would be useful, eg:
([A-Za-z0-9]+)_([A-Za-z0-9]+) > \2_\1.
Would rename Foo_Bar to Bar_Foo.
We would likely have a second regular expression option for the "Replace" field, so the current basic matching would still be possible.