Which regex engine does this use?

This tester uses the browser's JavaScript RegExp engine. Some features differ from PCRE or other flavors.

Yes. All testing is done locally in your browser. Nothing is sent to our servers unless you export patterns manually.

Can I save frequently used patterns?

Yes. Save and load regex patterns locally in your browser, and export/import them as JSON files.

Developer Tools

Powerful Regex Tester & Debugger. Test regex, view matches, capture groups, replace previews, and debug with real-time highlighting - client-side.

Regular Expression:

Quick Presets:

Test String: 2 matches

#	Match	Index	Groups
1	`support@softechalert.com`	14	None
2	`sales@company.org`	42	None

Real-time regular expression testing and syntax validation

Detailed match lists with index and capture groups display

Support for global (g), case-insensitive (i), and multiline (m) flags

Built-in quick presets for emails, URLs, IPv4 addresses, and dates

Live match count badge and error diagnostics

Client-side execution ensuring test strings remain private

Enter or paste your text or data into the workspace input field.

Adjust settings, options, or flags according to your desired outcome.

Review the instant live output and analysis computed in real time.

Click Copy to clipboard or download the processed results.