You need to create a set of escaped (with \
) parentheses (that match the parentheses) and a group of regular parentheses that create your capturing group:
var regExp = /\(([^)]+)\)/;
var matches = regExp.exec("I expect five hundred dollars ($500).");
//matches[1] contains the value between the parentheses
console.log(matches[1]);
Breakdown:
\(
: match an opening parentheses(
: begin capturing group[^)]+
: match one or more non)
characters)
: end capturing group\)
: match closing parentheses
Here is a visual explanation on RegExplained