Optional test for ECMA 262 regular expressions?

[Relequestual]

pattern

The value of this keyword MUST be a string. This string SHOULD be a valid regular expression, according to the ECMA 262 regular expression dialect.

I've seen one or two implementations load in specific regex implementations which differs from the standard provided by the language of choice. We could add an optional test to run some basic checks on conformance to the SHOULD here.

I don't know the major differences between regex dialects, so I can't advise without research time I cannot commit right now.

Just a thought.

[Julian]

This is already present in https://github.com/json-schema-org/JSON-Schema-Test-Suite/blob/master/tests/draft6/optional/ecmascript-regex.json

[Relequestual]

I am bad. I Should have checked first.
Is there anything it supports which others will not? Or is that the best test we are going to get?

[johandorland]

https://en.wikipedia.org/wiki/Comparison_of_regular_expression_engines has a quite comprehensive list of things that various implementations do and do not support. There is currently one test that tries to differentiate from .NET, but if you add a few tests to make sure lookaheads and backreferences are supported, but not lookbehinds I think you have a fairly robust test suite.

[Relequestual]

OK. Let's close this as it feels already covered.
Thanks for looking into this @johandorland and thanks @Julian for the ongoing test suite work =]