Regular Expression Cheat Sheet

Complete regular expression cheat sheet with syntax, examples, and common patterns. Quick reference for regex metacharacters and quantifiers.

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What is the difference between * and + in regex?

* matches zero or more occurrences (including none), while + requires at least one occurrence. For example, 'ab*c' matches 'ac', 'abc', 'abbc'. 'ab+c' matches 'abc', 'abbc' but NOT 'ac'.

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