Regex Tester & AI Builder
Test regex patterns with live matching. Describe what you need in plain English and AI builds the regex.
About Regex Tester & AI Builder
A powerful regular expression tester with real-time matching, group highlighting, and an AI-powered builder. Describe what you want to match in plain English and get a working regex instantly. Includes cheat sheet and common patterns.
Frequently Asked Questions
What are regular expressions?▾
Regular expressions (regex) are patterns used to match character combinations in strings. They're essential for validation, search-and-replace, and data extraction in programming.
How does the AI regex builder work?▾
Describe what you want to match in plain English — like 'email addresses' or 'dates in MM/DD/YYYY format' — and AI generates a tested regex pattern with an explanation of each part.
Which regex flavors are supported?▾
The tester uses JavaScript's built-in regex engine, which supports most common features including lookahead, lookbehind, named groups, and Unicode properties.
Related Tools
JSON Formatter & Validator
Format, validate, and beautify JSON with AI-powered error explanations.
Diff Checker
Compare two texts side-by-side and see the differences highlighted.
Cron Expression Generator
Build and decode cron expressions visually. Describe your schedule in plain English and AI builds it.