Regex Tester
Test regular expressions live with match highlighting.
Type a pattern like \d{10} and watch every 10-digit number light up in your test text — with capture groups broken out. Regex is the fastest way to validate emails, extract data and clean text, once you survive the learning curve.
How to use the regex tester
- Enter your regex pattern.
- Paste test text.
- See matches and groups highlighted live.
Regex Tester — FAQs
How do I match an email?
^[^\s@]+@[^\s@]+\.[^\s@]+$ covers most cases. Perfect email regex doesn’t exist — validate by sending a confirmation email instead.
What are capture groups?
Parentheses ( ) that ‘capture’ parts of the match separately — e.g. (\d{4})-(\d{2}) grabs year and month from a date.
Greedy vs lazy matching?
.* grabs as much as possible (greedy); .*? grabs as little as possible (lazy). Lazy is what you usually want inside delimiters.
How do I learn regex?
Start with \d \w \s, then . * + ?, then groups and anchors. Test every step live here — regex is learned by doing.
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