What Are Regular Expressions?
Regular expressions (regex) are patterns used to match character combinations in strings. They're essential for validation, search, and text manipulation in every programming language.
Write a regex, see live match highlighting, get a plain-English explanation, and optionally replace matched text.
Regular expressions (regex) are patterns used to match character combinations in strings. They're essential for validation, search, and text manipulation in every programming language.
Last updated: March 2026
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