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Text & Writing · Free online tool

Regular Expression Tester

Test JavaScript regular expressions against text and inspect matches.

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Ready to use Processes locally in your browser
Matches and groups
No upload is required for these text tools.

How to use Regular Expression Tester

Enter your pattern in the Pattern field. Avoid running untrusted complex expressions against very large text because regular expressions can be computationally expensive.

  1. Type or paste your input into the editor.
  2. Adjust available options, then choose Test Regular Expression.
  3. Review the result and copy or download it if useful.

Who is this tool for?

Students, developers, designers and anyone who works with text & writing can use this tool to quickly test concepts without installing a full development environment.

Privacy and safety

Processing for this tool happens inside your browser, and CodingPremise does not receive the text you enter through a server-side processing endpoint. Your browser may still contact our hosting service to load this page. Avoid pasting passwords, private API credentials, or other sensitive information into websites you do not control.