Support contains operator

[KyleJamesWalker]

Description

Add the contains operator.

Note: This hasn't been tested yet, I wanted to see about getting some feedback before proceeding with this PR.

Issues Resolved

#61

Check List

• All tests pass.
• New functionality includes testing.
• New functionality has been documented in the README if applicable

[kuldeepluvani]

💯

[dmlb2000]

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?

[KyleJamesWalker]

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.

[KyleJamesWalker]

@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.

[KyleJamesWalker]

@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

[dmlb2000]

@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.

[KyleJamesWalker]

@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.

[dmlb2000]

Thanks for the contribution. Looks good to me!