Issues with regex in apply rules tool: optional groups

[hexylena]

Describe the bug

1. The expression (.*)(.fa)? fails to match datasets when it should.

Galaxy Version and/or server at which you observed the bug
Galaxy Version: 24.1.4.dev0

Browser and Operating System
linux/chrome

To Reproduce
Steps to reproduce the behavior:

1. Create a collection with datasets like asdf.fa and bsdf.fa and maybe csdf
2. apply rules
3. create column from regular expression
4. Using Groups
5. Expression (.*)(.fa)?
6. Number of groups: 1

Expected behavior

I expect it to select just the matching portion of the filename, so I can make the names uniform.