i Hate Regex

An online regular expression cheat sheet and playground that focuses on practical, commonly needed regex patterns for everyday programming tasks. Instead of presenting abstract syntax reference, it is organized around real-world use cases: username validation, phone number matching, email address extraction, date format validation, ASCII-only string checking, password strength rules, IP address matching (both IPv4 and IPv6), and social security number patterns. Each pattern comes with a pre-written expression and an interactive playground where users can test input strings against the regex. The site also includes a sandbox mode for experimenting with custom patterns. For developers who find themselves repeatedly searching for the same common regex patterns, this site provides a curated collection of battle-tested expressions that solve recurring validation tasks, along with community-contributed patterns via a submission form.