Javascript regex with lookahead and lookbehind being wrong?

Question

I'm using the following regex to match the word ' stores ' between ' / ' and ' ? ' with a possible forward slash ' / ' before the ' ? ' but for some reason it fails saying there's an invalid quantifier. Any idea why it might be wrong and quatifier is that? I tried removing ' /? ' but it still says the same thing.

var n=str.match(/(?<=\/)stores\/?(?=\?)/);

Thanks!

Answer 1

I think this is the invalid part: (?<=/) - javascript's lookahead is (?=y); it doesn't support lookbehinds, which is what I'm assuming you were trying to use. This regex should work though:

\/stores\/?\?

which matches:

a forward slash,

followed by the string 'stores',

followed by zero or one forward slash,

followed by a question mark.