100% Client-Side Processing

Regex Tester

Free Online Regular Expression Testing Tool

Test, debug, and learn regular expressions with real-time matching. All processing happens in your browser - your data never leaves your device.

Regular Expression

//g

Flags

Test String

Regex Templates

Email Address

Validates standard email format

/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/

URL

Matches HTTP/HTTPS URLs

/^https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)$/

Phone Number (US)

Validates US phone number formats

/^1[3-9]\d{9}$/

Phone Number (International)

Validates international phone numbers

/^\+?[1-9]\d{1,14}$/

Date (YYYY-MM-DD)

Matches ISO date format

/^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$/

Time (24-hour)

Matches 24-hour time format

/^([01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$/

IPv4 Address

Validates IPv4 address format

/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/

IPv6 Address

Validates IPv6 address format

/^([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$/

Strong Password

At least 8 chars, uppercase, lowercase, number, special char

/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/

Username

Alphanumeric, 3-16 characters, underscores allowed

/^[a-zA-Z0-9_]{3,16}$/

URL Slug

Valid URL slug format

/^[a-z0-9]+(?:-[a-z0-9]+)*$/

Hex Color

Validates hex color codes

/^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/

Credit Card

Validates major credit card numbers

/^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13}|6(?:011|5[0-9]{2})[0-9]{12})$/

HTML Tag

Matches HTML tags

/<([a-zA-Z][a-zA-Z0-9]*)[^>]*>(.*?)<\/\1>/

Chinese Characters

Matches Chinese characters only

/^[\u4e00-\u9fa5]+$/

Match Results

Enter a pattern to see matches

Highlighted Matches

Why Choose Our Regex Tester?

Powerful features for developers and learners

100% Private

All regex testing happens in your browser. Your data never leaves your device - perfect for sensitive patterns.

Real-time Matching

See matches instantly as you type. No buttons to click, just immediate visual feedback.

Pattern Explanation

Get detailed explanations of your regex pattern. Learn what each part does as you build it.

Ready-to-use Templates

Access a library of common regex patterns for email, URLs, phone numbers, and more.

Multi-language Support

Full support for both English and Chinese interfaces. Switch languages anytime.

Dark Mode

Easy on the eyes with automatic dark mode support. Toggle between light and dark themes.