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Regex Cheat Sheet/Zero or one

Make the previous token optional.

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Section: Quantifiers

Zero or one

regex
regex
colou?r
Explanation

Matches both `color` and `colour`.

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Repeat the previous token any number of times.
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One or more
Repeat the previous token at least once.
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Exact repetition
Match an exact number of repetitions.
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Range repetition
Match between a minimum and maximum number of repetitions.
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Match at least a minimum number of repetitions.
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Lazy zero or more
Use the shortest possible match.
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