Regex

Groups and Capturing

Capture, non-capture, and named groups.

#group#capture#named

Code

regex

(abc)         capturing group
(?:abc)       non-capturing group
(a)(b)(c)     groups 1, 2, 3
(?P<name>\w+) named group (Python/PCRE)
(?<word>\w+)  named group (.NET/Java/JS)
(?<word>\w+)\k<word>  named backreference
\g<1>         backref to group 1 (Python)

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