Skip to content
TRULLZ

Free Regex Tester

Test regular expressions with live highlighting.

//g
Your matches will appear here.
Ad space · tool-below

How to use the Regex Tester

  1. 1Enter pattern and flags.
  2. 2Paste test text.
  3. 3See matches & replace preview.

Features

  • Live highlighting
  • Group capture view
  • Replace preview
  • Common pattern cheatsheet

Frequently Asked Questions

Which regex flavor is used?

JavaScript (ECMAScript) regex, as used in all modern browsers.

Related Tools

Find & Replace

Replace text with optional regex support.

Text

Cron Expression Explainer

Explain cron schedules in plain English.

Developer
Popular

Text Cleaner

Remove extra spaces, breaks and invisible characters.

Text

JSON Validator

Validate JSON with exact error locations.

Developer

About the Regex Tester

Test regex patterns against sample text with match highlighting, groups and replace preview. The Regex Tester runs entirely in your browser — your data is processed locally and never uploaded to a server. Explore more Developer tools or browse all free online tools.