Allow filter keys with a regex match

[drugan]

Allows to apply a regular expression on a key instead of value. So you can get area only of the room entries of the house:

$.house[?(/roo.*/)][area]

https://extendsclass.com/jsonpath-tester.html

[Galbar]

Hello @drugan, thanks for the pull request! Sorry for the delay :sweat_smile:

It looks great!

Could you add at least one test case for it and add it to the JsonPath Language section in the readme?

With that in place I'll merge this and we can have this feature in a release!

[drugan]

Hi @Galbar,

Yes, I do it as soon as possible.

[drugan]

@Galbar

Done. I've also added the PCRE i and x modifiers which makes writing regex patterns a little easier:

https://www.php.net/manual/en/reference.pcre.pattern.modifiers.php