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A regular expression (regex) is a pattern used to match character combinations in strings. It is widely used for text search, validation, and replacement in programming.
g = global (find all matches), i = case-insensitive, m = multiline (^ and $ match line boundaries), s = dotAll (. matches newline characters).
Yes. All regex testing runs entirely in your browser using the native JavaScript RegExp engine. No data is sent to any server.