Regex Tester
Write the pattern, paste your text and instantly see what it matches.
- Never leaves your device
- No sign-up
2 matches
Contact: emma@example.com and liam@company.com
Quick answer: To test a regex, write the pattern, choose the flags (g, i, m, s, u) and paste your test text. Matches are highlighted, capture groups appear in a table and, if you like, you can preview a replacement using $1, $2.
How to do it in 3 steps
- 1Write the regular expression.
- 2Paste the test text.
- 3See the highlights and groups.
Why use Pronto Arquivo
Real-time highlighting
Matches are marked as you type.
Capture groups
A table of every group in every match.
Replace
Test replace with $1, $2.
Shortcuts
Email, URL, date, numbers and ZIP code patterns ready to use.
Guides
Syntax
Uses the JavaScript engine, the same as Node.js and browsers, with named groups and lookbehind.
Frequently asked questions
What is a regex?
A regular expression: a pattern for finding or validating text, like emails and dates.
Which syntax does it use?
JavaScript (ECMAScript).
What does the g flag mean?
Global: it finds every match, not just the first.
Is my text uploaded?
No. Everything is processed in your browser.
