Javascript regexp: replacing $1 with f($1)

Question

I have a regular expression, say /url.com\\/([A-Za-z]+)\\.html/, and I would like to replace it with new string $1: f($1), that is, with a constant

Answer 1

When using String.replace, you can supply a callback function as the replacement parameter instead of a string and create your own, very custom return value.

'foo'.replace(/bar/, function (str, p1, p2) {
    return /* some custom string */;
});