Free

4.8(147 reviews)

Regex Tester

Build, test, and debug Regular Expressions in real-time with syntax highlighting, capture group breakdown, and common cheat sheets.

100% Client-Side Sandbox Instant Processing Automatic File Purge 21.0k runs executed

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Workflow Guide

How Regex Tester Works

Follow these simple steps to process your files or code with maximum accuracy.

Input your regular expression pattern and select flags

Type or paste sample text into the test area

View instant highlights and matched substring coordinates

Copy regex code formatted for JavaScript, Python, or PHP

Specifications

Features & Capabilities

Engineered for production reliability, client-side speed, and clean output.

Live match highlighting as you type

Detailed capture group inspector (Group 1, Group 2, etc.)

Toggle flags: global (g), case-insensitive (i), multiline (m)

Curated library of standard regex patterns (Email, URL, IP, Phone)

Client-Side Privacy Guarantee

All transformations take place directly inside your device's browser memory. Your files are never stored on external disk arrays, eliminating any risk of unauthorized data exposure.

Frequently Asked Questions

Common questions about using Regex Tester.

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