Yes, completely free with no sign-up. Test unlimited regular expressions for your development needs.
No, all regex testing happens in your browser. Your patterns and test strings never leave your device.
Type your regular expression in the pattern field, including modifiers like /g for global, /i for case-insensitive, or /m for multiline. Paste or type the text you want to test against your regex in the test string area. Matches are highlighted instantly as you type, showing you how many matches were found. Read the human-readable explanation of what your regex pattern does. Try different test strings to ensure your regex handles all expected inputs and edge cases.
We use JavaScript regex (ECMAScript). This is compatible with most modern programming languages with minor differences.