Use RegExp to match a parenthetical number then increment it

Question

I've been trying to find a way to match a number in a Javascript string that is surrounded by parenthesis at the end of the string, then increment it.

Say I have a string:

var name = "Item Name (4)";

I need a RegExp to match the (4) part, and then I need to increment the 4 then put it back into the string.

This is the regex I have so far:

\b([0-9]+)$\b

This regex does not work. Furthermore, I do not know how to extract the integer retrieved and put it back in the same location in the string.

Thanks.

Answer 1

The replace method can take a function as its second argument. It gets the match (including submatches) and returns the replacement string. Others have already mentioned that the parentheses need to be escaped.

"Item Name (4)".replace(/\((\d+)\)/, function(fullMatch, n) {
    return "(" + (Number(n) + 1) + ")";
});