Retrieve only a portion of a matched string using regex in Javascript

Question

I've got a string like

foo (123) bar

I want to retrieve all numbers surrounded with the delimiters ( and ) .

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

How can I retrieve only a portion of the matched string without following it up with varname.replace() ?

Answer 1

是的，使用捕获（非转义）的parens：

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