Free Online Regex Tester – Test, Debug & Validate Regular Expressions

Online Regex Tester

Test, debug, match and replace text using regular expressions.

Regular Expression

Enter Regex Pattern

Global (g) Ignore Case (i) Multiline (m) Dot All (s) Unicode (u)

Ready-to-Use Regex Examples

Test Text

Enter or Paste Your Text

Match Summary

0 Total Matches

0 Unique Matches

0 Capture Groups

Highlighted Text

Your highlighted matching text will appear here.

Match Details

No match results yet. Enter a pattern and test text.

Find and Replace

Replacement Text

Replacement Preview

Replacement output will appear here.

Note: This tool uses the native JavaScript Regular Expression engine. Regex syntax and behavior may differ from Java, Python, PHP and other programming languages.

Your text is processed locally in your browser. No data is uploaded to a server.