Add in RE_* support as feature_flag action #1178
Description
Is your feature request related to a problem? Please describe.
Just a feature request
Describe the solution you'd like
Add in extra actions to test for regular expression matches/searches.
Describe alternatives you've considered
I actually think in many cases the current actions are sufficient. There are always cases where using a regular expression fills the gap and I've already found one where I need to test legacy data to enable a toggle by way of a re.search.
Additional context
See linked PR #692