Enhancement/stricter valve checks

[yasserf]

No description provided.

[Iiridayn]

Continuing on from #462, I missed another fun way to call a function:

var foo = { '/foo/': console.log }; foo[/foo/]('test');
Edit: or ({ '/foo/': console.log })[/foo/]('test') without variables :S

Edit:

FUNCTION_REGEXP = /([\w]+(?:['"`/]\])?)\s*\(/g

could work, but it feels too much like blacklisting/chasing holes - and still no obvious solution for the `` case