Can you give some examples in other places where ~= represents the in operation? Most of the places I'm aware of ~= is more of a regular expression match. Not what the in operator does in Python.

Also looks like you need some testing to cover the new code you created.

Thoughts?

I'm currently trying to create some unit tests, it took me a little bit to get the antlr4 code generated, and now seeing what I might of missed to get past the:

token recognition error at: '~'

And let me look more into the the ~= vs contains, there's a good chance you're right, I was mainly just trying to figure out how to add to the code, before finalizing (hope it's not too distracting for you), thanks for the library!

I just checked and yes the ~ is for regex, I'll flip to:

contains | Checks if a string contains the specified substring (case-sensitive), or an array contains the specified element.

and maybe see if I can easily add regex or not.

@dmlb2000 I think this should cover the cases for contains, let me know if you'd like more tests?

Also it would be pretty easy to add the ~= to do a regex match on the value, would you like me to add that also? For my use case I really only needed a substring, but I can see where a full regex would be useful.

@dmlb2000 I've also started adding the ~= but I'll have to understand the antlr4 syntax a bit more to allow escape characters, and possibly passing flags along with it.

I'll create a PR against this repo later but if you want to look at the possible changes I have a working branch on my fork if you have any advice: KyleJamesWalker#1

@KyleJamesWalker I agree it will be a challenge to get the regex to pass through antlr to apply the standard regex library. However, if you feel you have the ability/time to do that I can review and help a little. Feel free to submit a new bug with the regex addition and make a merge request.

@dmlb2000 How do you feel about this PR. Once this is merged, I can try and work on some more ideas on how to pass the flag to the regex matching. I at least have a small start so far with the 2nd PR.