support specifying a custom regex

[jalalawqati]

I have a convenient extension around NSLocalizedString:

var localized: String {
   NSLocalizedString(self, comment: "")
}

To make SwiftParser recognize this pattern I need to pass it a custom regex. This branch does exactly that. The configuration yml .stringslint.yml could then have:

swift_parser:
  regex:
    pattern: "\"([^\"]+)\".localized"
    match_index: 1

The match index indicates which index of the regex matches represents the localization key.

Please let me know if this is something you'd like to merge, otherwise I can move this to my fork. Thanks for the nice tool!

[dral3x]

Hi @jalalawqati, thank you very much for integrating this feature on stringslint!
I'm surely interested in having these changes merged.
Let me check the PR content 🚀

[dral3x]

This is a very good work! Thank you @jalalawqati 👍

[dral3x]

@jalalawqati stringslint 0.1.6 is out now. Thanks for your contribution!
https://github.com/dral3x/StringsLint/releases/tag/0.1.6

[jalalawqati]

@dral3x Thanks for the quick review and for the release 👍