Regex Tester

Test, debug, and understand regular expressions in real time.

Write your regex pattern and see live match highlighting as you type. Inspect every capture group, named group, and match index. Use the Replace tab to preview substitutions, or switch to Explain for a human-readable breakdown of every token in your pattern.

Generate ready-to-use code in 8 languages — JavaScript, Python, Go, PHP, Java, C#, Rust, and Ruby. Browse the built-in pattern library for common regex recipes (emails, URLs, dates, and more), or use the Reference tab as a quick cheat sheet. Everything runs in your browser — nothing is sent to a server.

//g

Test String

0 matches

Enter a pattern and test string to see matches

Frequently Asked Questions

Common questions about regular expressions, syntax, and this tool.

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