Regex Tester

Live Regex Editor & Tester

Write, test, and debug your regular expressions in real-time.

0 matches 0 ms

Regular Expression

/ /

Test String

Highlighted Matches

Detailed Matches & Groups Explorer

No matches found. Adjust your pattern or test string to see detailed match information here.

Preset Pattern Library

Quick Reference

\d Any digit (0-9)
\D Any non-digit character
\w Any word character (a-z, A-Z, 0-9, _)
\W Any non-word character
\s Any whitespace character (spaces, tabs, newlines)
\S Any non-whitespace character
. Any character except line breaks
[abc] Any character in the set (a, b, or c)
[^abc] Any character NOT in the set

* 0 or more times (greedy)
+ 1 or more times (greedy)
? 0 or 1 time (greedy)
*?, +? Lazy match (minimal matches)
{n} Exactly n times
{n,} n or more times
{n,m} Between n and m times

^ Start of string (or line in multiline)
$ End of string (or line in multiline)
\b Word boundary
| OR operator (e.g. cat|dog matches cat or dog)
(...) Capture group
(?:...) Non-capturing group
(?=...) Positive lookahead assertion
(?!...) Negative lookahead assertion

Developer Tools 540K uses

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How to use the Regex Tester tool

Using our Regex Tester is incredibly easy and entirely free. We designed our Developer Tools specifically for everyday users who need to get things done quickly without downloading complicated software or registering for an account.

Enter your pattern: Type the regular expression you want to test.
Add a test string: Paste sample text to match against your pattern.
See live matches: Matches are highlighted instantly as you refine the pattern.

100% Secure

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Lightning Fast

We use high-performance cloud processing to ensure your files are ready in seconds, not minutes.

Works on Mobile

No app installation needed. Use our tools seamlessly on iOS, Android, Mac, or Windows.

Frequently Asked Questions

Does it highlight matches live?

Yes. Matches update in real time as you edit the pattern or text.

Is it good for learning regex?

Yes. Instant feedback makes it easy to experiment and learn.

Is my data private?

Yes. Testing runs entirely in your browser.