About Regular Expression Tester Online — Free Regex Validator

Validate and test regular expressions in real time. See matches highlighted, inspect capture groups, and test against sample strings.

regular expression testerregex pattern testervalidate regex onlineregex match onlineregexp tester

✨ Key Features of Our Regular Expression Tester Online — Free Regex Validator

  • ✓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 Regular Expression Tester Online — Free Regex Validator

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›Regular Expression Tester Online — Free Regex Validator

Love this tool? Try our other Development tools!

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

Browse All Tools →