Regex terms

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🔍 Powerful pattern matching — with great power comes great confusion

Regular expressions are a compact language for describing patterns in text — extraordinarily powerful, notoriously hard to read, and present in virtually every programming language. This category covers syntax, anchors, groups, lookaheads, quantifiers, and the performance traps like catastrophic backtracking that turn a useful pattern into a production incident.

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PCRE in PHP PHP 5.0+

preg_match, preg_match_all, preg_replace, preg_split — and checking === false to distinguish errors from no-match.

2mo ago regex intermediate