Developer tools
Regex tester
Test regular expressions with flags, see matches, and run replace — entirely in your browser.
9 match(es)
Matches
1. The 2. quick 3. brown 4. fox 5. jumps 6. over 7. the 8. lazy 9. dog
Replace result
The quick brown fox jumps over the lazy dog.
Your data never leaves the browser.
How it works
- Enter a pattern and optional flags.
- Paste a test string and an optional replacement.
- Matches and replace output update as you type.
FAQ
- Which flags are supported?
- g, i, m, s, and u — the same flags as JavaScript RegExp.
- Is my text uploaded?
- No. Matching runs only in your browser.