Which regex flavor is used?

Regex (Regular Expression) Tester

Test and debug regular expressions with live match highlighting, capture groups, and flag controls.

Zero Server Uploads

//gi

Test String

1 lines72 B

Contact us at support@devtoolkit.io or sales@company.org for assistance.

Matches Found (2)

39 B

Match #1Index: 14

support@devtoolkit.io

Capture Groups:

Group 1: support

Group 2: devtoolkit.io

Match #2Index: 39

sales@company.org

Capture Groups:

Group 1: sales

Group 2: company.org

Client Memory Engine72 chars

100% Client-Side. No data ever leaves your browser.

Interactive Regular Expression Workbench

Test patterns against sample text with instant visual highlighting of full matches, group captures, and indices without waiting or page reloads.

Key Highlights & Capabilities

Configurable flags: Global (g), Case-insensitive (i), Multiline (m), DotAll (s)
Visual match highlighting in sample text
Capture groups table showing index and captured content
Common presets: Email, URL, IP Address, Phone Number, Date

Technical Specifications & In-Browser Limits

Execution & Privacy Model

100% in-browser client execution. No server logs, no database storage, and no network transmission of editor content.

Performance & Payload Capacity

Equipped with virtualized gutter windowing. Handles files up to ~25 MB or 400,000 lines smoothly without freezing browser UI.

Frequently Asked Questions

It uses JavaScript's native ECMAScript RegExp engine running directly in your browser.

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