CODEWITHSUNDEEP
javascriptregex
Asperger
Asperger

Reputation: 3222

Backreference non capture group in javascript regex

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.

Upvotes: 1

Views: 548

Answers (1)

Ray Toal
Ray Toal

Reputation: 88378

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`);

Upvotes: 2

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