Everything runs in your browser. Your data is never sent to our servers.
About Regex Tester
Regex Tester lets you try regular expressions on your own text and see every match highlighted, with positions and capture groups listed below.
Tips for best results
- Use parentheses to capture parts of a match.
- A pattern that matches nothing can still be valid, check your flags.
- This tester uses the JavaScript regular expression syntax.
How to use Regex Tester
- 1
Enter a pattern
Type your regular expression without the slashes.
- 2
Choose flags
Turn on global, ignore case, multiline and other flags.
- 3
Paste test text
Matches are highlighted and listed immediately.
Frequently asked questions
Which regex flavour is this?
JavaScript. Most basic patterns work the same in other languages, but some features differ.
Why does the page say my pattern is invalid?
The pattern has a syntax error, for example an unclosed bracket.
Is my text uploaded?
No. This tool runs inside your browser, so your data is processed on your own phone or computer and is not sent to our servers.