Regex Validator

Test & Validate Regular Expressions

Test your regular expressions with real-time matching, explore common patterns, and learn regex syntax. Perfect for developers, data analysts, and anyone working with text processing.

Regex Pattern

Results

Pattern StatusValid

Matches Found0

No matches found

Common Regex Patterns

Email Validation

Validates email addresses

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

Example: user@example.com

Phone Number (US)

US phone number format

^\+?1?[-.\s]?$?([0-9]{3})$?[-.\s]?([0-9]{3})[-.\s]?([0-9]{4})$

Example: (555) 123-4567

URL Validation

Validates HTTP/HTTPS URLs

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

Example: https://www.example.com

Password (8+ chars, mixed case, number)

Strong password with uppercase, lowercase, and number

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

Example: MyPass123

Credit Card (Visa/MasterCard)

Visa and MasterCard numbers

^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14})$

Example: 4111111111111111

Date (YYYY-MM-DD)

ISO date format

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

Example: 2024-12-25

IPv4 Address

Validates IPv4 addresses

^(?:(?: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]?)$

Example: 192.168.1.1

Hex Color Code

CSS hex color codes

^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$

Example: #FF5733

Username (alphanumeric, underscore)

Username with 3-20 characters

^[a-zA-Z0-9_]{3,20}$

Example: user_123

Social Security Number

US SSN format

^\d{3}-\d{2}-\d{4}$

Example: 123-45-6789

Regex Metacharacters

.Matches any character except newline

^Matches start of string

$Matches end of string

*Matches 0 or more of the preceding element

+Matches 1 or more of the preceding element

?Matches 0 or 1 of the preceding element

|OR operator - matches either pattern

[]Character class - matches any character inside

[^]Negated character class

()Grouping - creates a capture group

\dMatches any digit (0-9)

\wMatches word characters (a-z, A-Z, 0-9, _)

\sMatches whitespace characters

\bWord boundary

Regex Flags

gGlobal

Find all matches, not just the first

iCase Insensitive

Match regardless of case

mMultiline

^ and $ match line breaks

sDot All

'.' matches newline characters

uUnicode

Handle Unicode characters properly

ySticky

Match only at the last index

Regex Validator - Complete Guide

What is Regular Expression (Regex)?

Regular expressions are powerful patterns used to match, search, and manipulate text. They are essential tools for developers, data analysts, and anyone working with text processing. Our free regex validator helps you test and debug regular expressions in real-time.

Common use cases include email validation, phone number formatting,URL validation, password strength checking, and data extractionfrom text documents.

How to Use Our Regex Validator

• Enter your regex pattern in the input field
• Add test flags like global (g) or case-insensitive (i)
• Type test text to see matches in real-time
• Browse common patterns for quick reference
• Learn syntax with our metacharacter guide

💡 Regex Tips & Best Practices

• Start simple and build complexity gradually
• Test thoroughly with various input examples
• Use anchors (^ and $) for exact matches
• Escape special characters with backslash (\)
• Use character classes [a-z] instead of [abcdef...]
• Consider performance for large text processing

How to Use the Regex Validator

🔧 Basic Usage

1. Enter Your Pattern: Type your regular expression in the "Regular Expression" field
2. Set Flags: Choose appropriate flags like global (g) or case-insensitive (i)
3. Add Test Text: Enter sample text to test your regex against
4. View Results: See matches highlighted in real-time with match count

💡 Advanced Features

Common Patterns: Click on pre-built patterns to quickly test common use cases
Pattern Library: Browse email, phone, URL, and other validation patterns
Syntax Reference: Use the metacharacters guide for regex syntax help
Error Detection: Invalid patterns are highlighted with helpful error messages