Backreference Constructs

The following table lists optional parameters that add backreference modifiers to a regular expression.

Backreference construct	Definition
\number	Backreference. For example, `(\w)\1` finds doubled word characters.
\k<name>	Named backreference. For example, `(?<char>\w)\k<char>` finds doubled word characters. The expression `(?<43>\w)\43` does the same. You can use single quotes instead of angle brackets; for example, `\k'char'`.

Note the ambiguity between octal escape codes and \number backreferences that use the same notation. See Backreferences for details on how the regular expression engine resolves the ambiguity.

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Backreference Constructs

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