Test Regex Pattern
Writing regex is only half the challenge — testing it against real data is where bugs surface. This tool highlights matches in real time as you type, shows capture groups, and explains what each part of your pattern does in plain English.
Open Regex Tester →How to Test Regex Pattern
- Open the Regex Tester tool on ToolPrime
- Enter your regular expression pattern
- Paste test strings in the input area
- See matches highlighted in real time with capture group details
- Adjust your pattern until all expected matches are correct
Common Use Cases
- Debug complex regex patterns against sample data before deployment
- Learn regex by experimenting with patterns and seeing instant results
- Validate email, phone, or URL patterns against edge cases
- Test data extraction patterns for web scraping projects
Frequently Asked Questions
Which regex flavor does this tool use?▾
The tool uses JavaScript regex (ECMAScript), which is the standard for web browsers and Node.js applications.
Does it show capture groups?▾
Yes, each capture group is highlighted in a different color and listed separately with its matched content.
Can I test with multiple flag combinations?▾
Yes, toggle flags like global (g), case-insensitive (i), multiline (m), dotAll (s), and unicode (u) independently.