Are regex capture groups displayed separately?

Yes. Each capture group ($1, $2, etc.) is listed in a structured match table alongside start indices.

Updated: August 2026 • Verified v1.2

Regular Expression (Regex) Tester & Match Explainer

Developer ToolsHigh Usage

Local Browser Execution: Your input is processed locally in your browser and is not sent to UTL servers.

RegExp: new RegExp(pattern, flags).exec(testText)

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Understanding Your Results

Highlights all pattern matches in text, lists match indices and capture groups, and validates JavaScript RegExp flag compliance.

Practical Guidance & Next Steps

Use preset patterns (Email, URL, IPv4, Date, Hex Color) as verified starting points for form validation.

What is this?

A developer testing tool for building, validating, and debugging regular expressions with live visual match highlights.

How does it work?

1. Enter your regex pattern and select flags (g, i, m, s). 2. Paste sample text to match against. 3. View real-time highlighted matches and detailed capture group breakdown table.

Why use it?

Eliminates regex syntax bugs before deploying code to production applications.

Technical Scope & Calculation Limitations

Uses standard ECMAScript (JavaScript) RegExp engine. Non-JS PCRE features (lookbehinds in older browsers) are governed by the browser engine.

Frequently Asked Questions

Supports standard JavaScript RegExp flags: 'g' (global match), 'i' (ignore case), 'm' (multiline), and 's' (dotAll - allow dot to match newlines).

Windows Desktop & Widget Options

Want this capability on your Windows desktop?

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Desktop App

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Free open-source offline desktop app for Windows featuring 30+ formatters, converters, and hash tools.

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