Table of Contents
Test your regular expressions
Enter a pattern and test string to see matches
How to Use the Regex Tester
Enter your regular expression pattern and choose flags (g, i, m, s, u, y). Type your test string in the text area and see all matches highlighted in real time. The tool shows match details, capture groups, and provides a plain-English explanation of what your regex does.
Features
ToolNova Regex Tester includes:
- Real-time regex matching and highlighting
- All RegExp flags support (g, i, m, s, u, y)
- Capture group extraction
- Regex explanation in plain English
- Common regex pattern library
- Error highlighting for invalid patterns
Why Use a Regex Tester?
Regular expressions are powerful but notoriously tricky to get right. ToolNova Regex Tester helps you develop and debug patterns interactively, with instant feedback and explanations. It is an indispensable tool for developers working with text processing, validation, and data extraction.
Frequently Asked Questions
What regex engine is used?
The tool uses JavaScript's RegExp engine, which is similar to Perl-compatible regex (PCRE) with some differences.
Does it support capture groups?
Yes. Capture groups are highlighted and extracted separately in the results panel.
Can I save my regex patterns?
The tool includes a library of common regex patterns for emails, URLs, phone numbers, and more.
Does it explain regex syntax?
Yes. The tool provides a plain-English explanation of what your regex pattern matches.
Is this tool free?
Yes. ToolNova's Regex Tester is completely free with no usage limits.