Regex Tester

Test JavaScript regular expressions with live match highlighting, flags and capture groups.

Privacy: This tool runs entirely in your browser. Your data never leaves your device and is never uploaded to any server.

Frequently asked questions

Which flavor of regex is used?

JavaScript regular expressions, the same engine used in browsers and Node.js.

What flags are supported?

Global, ignore-case, multiline, dotAll and unicode flags.

Is the input sent anywhere?

No. Matching runs locally in your browser.

Compare two blocks of text line by line and see exactly what was added and removed.

Convert text between UPPERCASE, lowercase, Title, camelCase, snake_case, kebab-case, slug and more.

Write Markdown and preview the rendered HTML live, entirely in your browser.