About Regex Tester

The Regex Tester helps you build, test, and debug regular expressions with live match results. It’s essential for developers working with pattern matching and text validation.

• What is a regex? A regular expression (regex) is a pattern used to match and manipulate text.
• How does it work? Enter your regex and test string, and see matches and errors instantly.
• Why use it? Regex is powerful for searching, replacing, and validating text in code and data.

All testing happens locally in your browser, your data never leaves your device.