Regex Tester
Build and debug regular expressions with live highlighting, groups and replace preview.
- Processed locally — your files never leave your device
- Free, no sign-up
- No file limits
//g
Liên hệ: hello@torola.site, support@example.com hoặc 0912345678.
Common patterns
2 matchesHow to use Regex Tester
- 1
Type a pattern and choose flags.
- 2
Paste test text — matches highlight instantly.
- 3
Inspect groups or preview a replacement.
Features
- Live highlightingEvery match is highlighted as you type.
- GroupsNumbered and named capture groups for each match.
- Replace previewTry $1-style replacements before using them in code.
Frequently asked questions
Which regex flavor is used?
JavaScript (ECMAScript), as used in browsers and Node.js.
Why does my pattern only match once?
Enable the g (global) flag to find every match.
Is it free?
Yes.