T

Regex Tester

Test regular expressions against sample text with live match highlighting.

Pattern

Test String

Matches

9 matches

The quick brown fox jumps over the lazy dog.
  • The@ 0
  • quick@ 4
  • brown@ 10
  • fox@ 16
  • jumps@ 20
  • over@ 26
  • the@ 31
  • lazy@ 35
  • dog@ 40

What the tool does

Regex Tester runs regular expressions against sample text with live match highlighting so you can debug patterns faster.

How to use it

  1. Enter a regular expression.
  2. Paste sample text to test against.
  3. Review highlighted matches and adjust flags/pattern as needed.

Supported formats

  • JavaScript-style regular expressions and plain text samples

Privacy & security

This tool runs entirely in your browser. Your data never leaves your device — nothing is uploaded to our servers.

FAQs

Which regex flavor is this?
It follows JavaScript regular expression behavior in your browser.
Can I test flags like global or case-insensitive?
Yes, when flags are exposed in the UI (for example g, i, m).
Is my text sent to a server?
No. Testing is local.