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Programming Concepts Intermediate

What is Regex (Regular Expression)?

A sequence of characters that defines a search pattern, used for string matching, validation, and text manipulation.

Regular expressions are powerful pattern-matching tools. Common syntax includes . (any character), * (zero or more), + (one or more), ? (optional), [] (character class), ^ (start), $ (end), and () (grouping).

Uses include email validation, log parsing, search-and-replace, and data extraction. While powerful, complex regex can be hard to read. Tools like regex101.com help build and test patterns. Every major programming language supports regex.

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