This regex tester helps you build and test regular expressions with instant visual feedback. See matches highlighted in real-time, explore capture groups, and debug your patterns efficiently. All processing happens in your browser.
Regular expressions are supported in all major programming languages and are used by 75% of developers for text processing tasks (JetBrains Developer Survey 2024). Regex proficiency is consistently ranked among the top skills for backend and data engineering roles.
\d+Match one or more digits[a-zA-Z]+Match one or more letters\w+@\w+\.\w+Simple email pattern^https?://URL protocol\b\d{3}-\d{3}-\d{4}\bUS phone number format^[A-Z][a-z]+$Capitalized wordHow do I test a regex pattern?
Enter your regular expression in the pattern field and type your test text below. Matches will be highlighted in real-time as you type.
What regex flags are supported?
All JavaScript regex flags are supported: g (global), i (case-insensitive), m (multiline), s (dotAll), u (unicode), and y (sticky).
How do I see capture groups?
After matching, all capture groups are displayed below with their match text and position. Use parentheses in your pattern to create groups.
Is my test data private?
Yes, all regex testing happens in your browser. Your patterns and test strings are never sent to any server.
Privacy First
All pattern matching happens in your browser. Your test strings never leave your device.