Regex Tester
Regex TesterTest regular expressions live with match highlighting. Fast, free and secure — works in your browser. By AK Computer, Dwarka.
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How to use
- 1 Type or paste your regular expression into the pattern field.
- 2 Set flags like g (global), i (case-insensitive) and m (multiline) as needed.
- 3 Enter your test string in the text area below.
- 4 Watch matches highlight live and review capture groups as you edit the pattern.
Frequently Asked Questions
Does the regex run on a server?
No, matching happens entirely in your browser using the JavaScript regex engine, so nothing is uploaded.
Which regex flavour is supported?
It uses the JavaScript (ECMAScript) regex syntax, including named groups and common flags.
Can I see capture groups?
Yes, each match displays its numbered and named capture groups so you can confirm your pattern extracts the right parts.