Regex Tester

Regular expressions (regex) are patterns used to match, search, and manipulate text. They're built into every programming language and are essential for input validation, log parsing, data extraction, and find-and-replace operations.

A regex pattern consists of literal characters and metacharacters like . (any character), * (zero or more), + (one or more), \d (any digit), and \w (any word character). Grouping with parentheses () lets you capture matched portions for extraction or backreferences.

Flags modify matching behavior: g (global — find all matches), i (case-insensitive), and m (multiline — ^ and $ match line boundaries). This tool highlights matches in real time so you can iterate on your pattern before embedding it in code.