Skip to content
dashutils

Regex Tester

Write a regular expression and see matches highlighted live in your test text, with every capture group listed and a replace preview.

  • Free, no sign-up
  • Runs locally in your browser
Loading tool…

Your files are processed on this device and are never uploaded to a server.

How to use the Regex Tester

  1. 1

    Enter a pattern and flags.

  2. 2

    Paste test text.

  3. 3

    Review matches and groups, and try a replacement.

Flags

g finds all matches, i ignores case, m makes ^ and $ match at line breaks, s lets . match newlines, u enables full Unicode and y makes the match sticky.

Frequently asked questions

Is my data sent to a server?

No. Everything runs in your browser as you type. Nothing is uploaded or logged, so it is safe to paste API responses, tokens and private text.