Regex tester
Test a regular expression against text and inspect the matches.
2 match(es)
dev@toolbin.dev@ 9hello@example.com@ 28🔒 100% client-side — no data sent
Test your regular expressions live: enter your regex and some text, and instantly see all matches, capture groups and positions highlighted. Perfect for building, debugging and validating a pattern before using it in your code. Testing runs entirely in your browser, with no data sent anywhere.
FAQ
What is a regular expression (regex)?
A regular expression is a sequence of characters that describes a search pattern. It is used to find, validate or replace text according to precise rules (for example validating an email).
Which regex syntax does this tester use?
The tool uses the browser's JavaScript regex engine. Most standard patterns work, but some features specific to PCRE, Python or Java may behave differently.
What do the g, i and m flags mean?
The g flag finds all matches (global), i ignores case (upper/lowercase) and m enables multiline mode where ^ and $ match each line.
How do I test a capture group?
Wrap the part of the pattern in parentheses, for example (\d{4}), and the tester will show separately the content captured by each group for every match.