Support Regular Expressions

[dluftspring]

It would be great to be able to match comment bodies based on regex whereas right now this only works with containment. From briefly looking at the source code I think this might work by replacing references to string.includes with string.match. Happy to try and contribute this feature if there is interest.

[peter-evans]

Hi @dluftspring

I would be interested in supporting this feature, but I would be concerned about making a breaking behaviour change if we replaced includes with match. What I would prefer to do instead is add a new action input called body-regex, and leave body-includes untouched. The new input can be added to this function.

Feel free to take a shot at it if you like. I'm going to be away for about 2 weeks now, but if you send a PR I'll review it when I'm back.