Regex Grouping

Parentheses Grouping ()

Parentheses are used to group characters together.

For example, the regex pattern (go)+gle matches gogle and gogogle.

Referencing a Group

You can reference a group using a backslash followed by the group number.

For example, the regex pattern ([0-9])\1 matches any repeated digit.

Parentheses Non-Capturing Group (?:)

A non-capturing group is used to group characters without capturing the match. So you can’t reference it later.

For example, the regex pattern (?::go)+gle matches gogle and gogogle.