PDF Mikata

Regex Tester

When you want to check that a regular expression matches as you expect.

What you enter is never uploaded. Everything is processed on this device.

  1. 1Write a pattern
  2. 2Enter the test text
  3. 3See the matches

Done

🔒 Your files are never sent to an external server. Everything is processed safely inside this browser.

How to use

  1. Enter a pattern in "Regular expression pattern".
  2. Enter the text you want to try in "Test text".
  3. The number and positions of matches are shown.

How it works

  • It uses the JavaScript regular expressions of your browser.
  • Flag "i" ignores case, "m" works line by line, and "s" lets "." match line breaks.

Notes

  • Even without flags, all matches are searched for.
  • Very complex patterns can run slowly.

FAQ

Is what I enter sent anywhere?

No. Everything is processed inside the browser on your device.

Can I use $1 in the replacement?

Yes. Writing $1 or $& in "Replacement" puts the matched parts in.

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Guides for this tool

How to Test a Regular Expression (Free)Regex for Postal and Phone NumbersReplacing Text in Bulk with RegexWhat the Flags g, i, m and s MeanCapturing Parts with ParenthesesWhat to Do When It Does Not WorkRegex Tester Without Uploading

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