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Feature: Backreferences | regexp-features

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Backreferences allow a pattern to re-match a previously matched capture group^{1 2} either by number (n) or by name.

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NOTE: The following syntax is an example based on some of the supported engines. For specific engine support, see Engines.

• \n — Where n is a decimal digit in the range 1-9. Matches the same string as the capture group n.
• \k<name> — Matches the same string as the named capture group with the name name.

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• Capturing Groups
• Named Capturing Groups

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