Match against "pattern*" as RegExp

[anthonyp-usafacts]

RE: #1281 (comment)

We want to allow people to use a wildcard string in their core-modules settings.

This will convert "pattern*" into RegExp('^pattern.*$') while also still enforcing a direct match on core-module strings that do not have the wildcard.

Per the issue thread, the allowable scenario was that the string ends in a wildcard, and nothing else.

[coveralls]

Coverage decreased (-13.1%) to 68.272% when pulling 6dd2145 on anthonyp-usafacts:Issue-1281-Accept-Wildcard-Ending-Core-Modules into bc99b86 on benmosher:master.

[ljharb]

Allowing regexes in eslint configs is a fast path to ReDOS CVEs. We can use minimatch to support globs, however.

[anthonyp-usafacts]

Allowing regexes in eslint configs is a fast path to ReDOS CVEs. We can use minimatch to support globs, however.

Very true. I'm kinda hoping the issue author jumps in here because I like people solving their own issues in community-driven repos. If I don't hear back I'll revise this later.

[ljharb]

After 2 years it's unlikely they will do so; any help from you is appreciated.

We'll also need a test covering this behavior.

[penx]

Very true. I'm kinda hoping the issue author jumps in here because I like people solving their own issues in community-driven repos.

I understand, but I've not written an eslint rule. When I looked 2 years ago I didn't know where to begin and didn't know anyone who could help me with it. Now you have a draft PR I have some context of what needs doing - although I still find it pretty confusing 😄

If someone wants to help walk me through it I'd be happy to give it a go.

Is there an existing test I could point a debugger at to step through this code and figure out what it's doing?