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Regex Cheat Sheet/Capturing group

Capture a submatch for reuse or extraction.

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Section: Groups and Alternation

Capturing group

regex
regex
(\d{4})-(\d{2})-(\d{2})
Explanation

Groups can be referenced later by number.

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Group without creating a numbered capture.
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Make an entire grouped piece optional.
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Match one branch or another.
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Start of string
Match only at the beginning of the input.
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