Can find "15" in "155", but not "55"

Question

The expression /\d5/g , matches with "15" in "155", but not "55".

How do I modify the expression so it matches with "15" and "55" in "155"?

Apparently, I have to do something called a "lookahead assertion".

let str = '155';
let regEx = /(?=(\d5))/g;
let matches = str.matchAll(regEx);

Regex doesn't define a way to match overlapping matches, so not all parsers support it. What parser are you using (ie where are you using your regex)? — SamBob, Dec 07 '21 at 16:54

score 0 · Answer 1 · answered Dec 07 '21 at 18:17

0

I don't know your parser, but maybe you have to say, that the "5" can occure more-times.

Something like this:

let regEx = /(?=(\d5)*)/g;

answered Dec 07 '21 at 18:17

Andreas Hauser

1 Answers1