Question

This javascript code:

var regex = /(?<=<img src=").*?(?=")/gm;
var src = regex.match(str); 

Gives me this error:

SyntaxError: invalid quantifier ?<=<img src=").*?(?=")
    in eval() line 0

What is the problem?

Answer 1

You need to escape your question marks like so:

/(\?<=<img src=").*?(\?=")/gm

EDIT:

The above fixes your “invalid quantifier” problem. But, as @Pointy points out in his comment, RegExp objects contain no match function. You’re likely looking for match on a string. (e.g., "string".match(/reg(exp)/);).