what is the match for this regex \g{2}(a)(b)

Asked Dec 21 '22 at 00:59

Active Dec 21 '22 at 00:59

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I am learning regex and i have a case related to backreference.

e.g. with (a)(b)\g{2} will match the result abb
however for the case \g{2}(a)(b) I haven't found a match yet.
I don't know why either. Can anyone explain to me how this backreference works. thank you very much. Sorry for my bad English

I tried replacing index 2 with 3 or less than 1, but it gives regex syntax error. It can be understood that here only two indexes are allowed, 1 and 2, corresponding to the positions of the 2 existing groups. however with \g{2}(a)(b) the results like bab or aab or ab do not match

asked Dec 21 '22 at 00:59

RacoonT

2

Possible duplicate of [this question](https://stackoverflow.com/questions/55786985/backref-before-associated-group) – dc-ddfe Dec 21 '22 at 01:26
Oh thank you. I have read the article and learned new knowledge – RacoonT Dec 23 '22 at 08:06

what is the match for this regex \g{2}(a)(b)

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