[
    {
        "description": "ECMA 262 regex dialect recognition",
        "schema": { "format": "pattern" },
        "tests": [
            {
                "description": "[^] is a valid regex",
                "data": "[^]",
                "valid": true
            },
            {
                "description": "ECMA 262 has no support for lookbehind",
                "data": "(?<=foo)bar",
                "valid": false
            }
        ]
    }
]

Add corner case tests for ECMA 262 regexes
Add corner case tests for ECMA 262 regexes

Add a very bizarre construct which only ECMA 262 allows in regexes. Check that
lookbehinds are _not_ supported.
