Retrieve only part of the matched string using regex in Javascript

Question

I have a string like

foo (123) bar 

I want to get all numbers surrounded by delimiters ( and ) .

If I use varname.match(/\([0-9]+\)/) , my delimiters are included in the response, and I get "(123)" when I really want "123".

How can I get only part of the matched string without following it with varname.replace() ?

Answer 1

Yes, use capture (unshielded) parsers:

 varname.match(/\(([0-9]+)\)/)[1]