Regex Tester
FreeTest regular expressions with live match highlighting and capture group details.
//gi
Flags:global · case insensitive
Test String
Matches Highlighted
2 matchesContact us at hello@utilio.com or support@utilio.shafyha.com for help.
Invalid: not-an-email, @missing, nodomain@
Match Details
1
hello@utilio.com
index: 14, length: 16
2
support@utilio.shafyha.com
index: 34, length: 26
Quick Reference
What is a Regex Tester?
A regex tester evaluates regular expressions against sample text in real time, highlighting matches and showing capture group details.
Why Test Regex Online?
Regular expressions are powerful but tricky to get right. Visual testing with match highlighting makes it easy to verify patterns before using them in production code.
Features
- Live match highlighting with capture group details
- Toggle flags: global, case-insensitive, multiline, dotAll, Unicode
- Preset patterns for email, URL, phone, IP and more
- Quick reference cheatsheet with common patterns
- Match details showing index, length and group values
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