JavaScript正则表达式中的反向引用非捕获组

Question

This is going to be a really short question...

Lets assume I have a regex like:

(Hello)(?:fooBar)

How can I backreference it using \\2? I know this works with normal capturing groups and that a non capturing group only groups tokens together but if there is any work-around then I would be glad to know.

Edit: Problem is:

I need to backreference to non capturing groups sometimes. For example there are moments where I really dont want that group to show up as a match but it shows up multiple times in the pattern which is why I prefer to backreference it.

Answer 1

As mentioned in the comments, a backreference applies only to a capture group.

But it sounds like your actual concern is with not repeating yourself. In this case, you can construct the regex:

const f = 'foobar';
const r = new RegExp(`Hello${f}blah${f}blah${f}blah`);