Question

What is the correct syntax for defining the beginning and end of a a regex word as the boundary in a capture group as follows:

var $classes = $( 'body' ).attr('class'); // string 'foo bar sub-theme-home';
var regex = /sub-theme-(?=(\b))/;
var sub_theme = regex.exec($classes);
console.log(sub_theme[0]);

This is matching sub-theme- and while it’s fine if I need to include that in my capture and do string replacement to remove it, I’m having trouble figuring out the proper syntax for my (?-(\b))/ capture group. Seems like with positive lookahead, sub-theme- should be the omitted portion and home should be captured… help?

Answer 1

Why not just capture the string you’re looking for?

var $classes = $( 'body' ).attr('class'); // string 'foo bar sub-theme-home';
var regex = /sub-theme-(\w+)/;
var sub_theme = regex.exec($classes);
console.log(sub_theme[1]);

See more about parenthesized substrings and the result of regex.exec(...) at MDN.