Not by default. Matching runs with the browser RegExp engine; drafts and history stay in localStorage on this device.

Which regex dialect do you support?

JavaScript RegExp only (including flags you enable). We do not pretend to support PCRE, .NET, or POSIX dialects.

Can I use it offline?

Yes. After you visit a tool once, the PWA can serve it offline from the browser cache.

Regex ToolsWorkbox

Free online regex tools. Test patterns locally in your browser with highlighting, templates, and shareable URLs.

Patterns and test text stay in your browser. Nothing is uploaded by default.

Live match highlighting, categorized templates, and a JS RegExp quick reference.

Aligned UX with other toolsworkbox sites — drafts, sharing, and consistent chrome.

Install to your desktop and keep using visited tools offline.

Test JavaScript regular expressions with live match highlighting and result tables.

Browse categorized JavaScript regex patterns and open them in the tester.

Quick reference for JavaScript RegExp syntax, flags, and replacements.

Is my text uploaded?: Not by default. Matching runs with the browser RegExp engine; drafts and history stay in localStorage on this device.
Which regex dialect do you support?: JavaScript RegExp only (including flags you enable). We do not pretend to support PCRE, .NET, or POSIX dialects.
Can I use it offline?: Yes. After you visit a tool once, the PWA can serve it offline from the browser cache.

Registered tools: 3