About Regex Tester Online — Test Regular Expressions Free

Test and debug regular expressions online. Live highlighting of matches, capture groups, flags support, and detailed match info.

regex tester onlinetest regex onlineregular expression testerregex debuggeronline regex checker

✨ Key Features of Our Regex Tester Online — Test Regular Expressions Free

  • ✓Real-time matching
  • ✓Color-coded highlighting
  • ✓Capture group display
  • ✓Match details panel
  • ✓Pattern library
  • ✓Flag toggles (g, i, m)
  • ✓Replace mode
  • ✓Share patterns

📖 How to Use Regex Tester Online — Test Regular Expressions Free

1

Enter Pattern

Type your regex pattern in the pattern field. Add flags as needed.

2

Enter Test String

Paste or type the text you want to test against.

3

View Matches

See matches highlighted in real-time with group details.

4

Refine Pattern

Adjust your pattern until it matches exactly what you need.

❓ Frequently Asked Questions

🔗 Related Free Tools

Text Diff

Compare two texts

Slug Generator

Generate URL slugs

Case Converter

Change text case

All Tools›Development›Regex Tester Online — Test Regular Expressions Free

Love this tool? Try our other Development tools!

We have 55+ free online tools for developers and everyone.

Browse All Tools →