A regular expression (regex) is a sequence of characters that defines a search pattern. Regex is used to match, find, replace, and validate strings in text. Supported in virtually every programming language, regex patterns range from simple literal matches to complex expressions with quantifiers, character classes, lookaheads, and capturing groups.
Regex is an indispensable tool for developers. It is used for input validation (email, phone numbers), text parsing, log analysis, search-and-replace operations, and data extraction. While regex has a steep learning curve, mastering it dramatically increases productivity when working with text-based data.
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