Regex Pattern Library Free

29 curated patterns — search, copy, and test

Email & Contact

Email Address

Validates standard email addresses

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

[email protected] [email protected]

US Phone Number

US phone numbers with optional country code and separators

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

(555) 123-4567 12345

International Phone

International phone numbers (E.164 format)

^\+?[1-9]\d{6,14}$

+447911123456 +0123

URLs & Web

URL (HTTP/HTTPS)

HTTP and HTTPS URLs

^https?://[^\s/$.?#].[^\s]*$

https://example.com/path?q=1 ftp://files.com

Domain Name

Valid domain names

^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$

sub.example.com -invalid.com

Slug (URL-friendly)

URL slugs — lowercase alphanumeric with hyphens

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

my-blog-post My Blog Post

IPv4 Address

Valid IPv4 addresses (0.0.0.0 — 255.255.255.255)

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

192.168.1.1 256.1.1.1

IPv6 Address

Full IPv6 addresses (no shorthand)

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

2001:0db8:85a3:0000:0000:8a2e:0370:7334 ::1

Data Formats

UUID v4

UUID version 4 (random)

^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$

550e8400-e29b-41d4-a716-446655440000 not-a-uuid

ISO 8601 Date

Dates in YYYY-MM-DD format

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

2024-03-15 03/15/2024

ISO 8601 DateTime

Full ISO 8601 datetime with timezone

^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|[+-]\d{2}:\d{2})$

2024-03-15T14:30:00Z 2024-03-15 14:30:00

JSON String

Valid JSON string with escaped characters

^"(?:[^"\\]|\\.)*"$

"hello \"world\"" "unclosed

Hex Color Code

CSS hex color codes (#RGB or #RRGGBB)

^#(?:[0-9a-fA-F]{3}){1,2}$

#ff5733 #xyz

Semantic Version

SemVer (e.g., 1.0.0, 2.1.3-beta.1)

^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-([\da-zA-Z-]+(?:\.[\da-zA-Z-]+)*))?(?:\+([\da-zA-Z-]+(?:\.[\da-zA-Z-]+)*))?$

1.2.3-beta.1 v1.2

Passwords & Security

Strong Password

Min 8 chars, uppercase, lowercase, digit, special char

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

Str0ng!Pass weak

JWT Token

JSON Web Token (3 base64url segments)

^[A-Za-z0-9_-]+\.[A-Za-z0-9_-]+\.[A-Za-z0-9_-]+$

eyJhbG.eyJzdW.SflKxw not.a.jwt.token.here

Numbers & Currency

Integer

Positive or negative integers

^-?\d+$

-42 3.14

Decimal / Float

Decimal numbers with optional fractional part

^-?\d+\.?\d*$

3.14159 abc

US Currency

US dollar amounts with commas and cents

^\$\d{1,3}(,\d{3})*(\.\d{2})?$

$1,234.56 1234.5

Credit Card (Visa)

Visa card numbers (13 or 16 digits starting with 4)

^4\d{12}(?:\d{3})?$

4111111111111111 5111111111111111

Identity & Codes

US Social Security

US SSN format (XXX-XX-XXXX)

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

123-45-6789 1234-5-6789

US Zip Code

5-digit or ZIP+4 format

^\d{5}(-\d{4})?$

90210-1234 ABCDE

MAC Address

Network MAC addresses with : or - separator

^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$

00:1A:2B:3C:4D:5E 001A2B3C4D5E

Code & Programming

Variable Name

Valid JS/Python/Java variable name

^[a-zA-Z_$][a-zA-Z0-9_$]*$

_myVar123 123abc

HTML Tag

Matches paired HTML tags with content

<([a-z][a-z0-9]*)\b[^>]*>(.*?)</\1>

<div>hello</div> <br/>

Import Statement (JS)

JavaScript/TypeScript import statements

^import\s+.*\s+from\s+['"].*['"];?$

import React from 'react'; require('react')

Text & Content

Whitespace Trim

Leading and trailing whitespace (use with replace)

^\s+|\s+$

hello hello

Duplicate Words

Repeated consecutive words

\b(\w+)\s+\1\b

the the quick the quick brown

Markdown Link

Markdown hyperlinks [text](url)

\[([^\]]+)\]$([^)]+)$

[Click here](https://example.com) plain text

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How to Use This Tool

Browse patterns

Explore categorized regex patterns for common use cases.

Copy a pattern

Click Copy to grab the pattern and use it in your code.

Test it

Open the Regex Tester to validate the pattern against your data.

Features

Curated Library

Pre-built patterns for emails, URLs, IPs, dates, and more.

Categorized

Patterns organized by category for quick discovery.

One-Click Copy

Copy any pattern directly to your clipboard.

Test Integration

Jump directly to the Regex Tester with a pattern pre-loaded.

Frequently Asked Questions

Are these regex patterns production-ready?

The patterns are well-tested starting points. However, regex for complex formats like email addresses or URLs may need adjustment for your specific requirements. Always test with your actual data.

What regex flavors are supported?

The patterns use PCRE (Perl Compatible Regular Expressions) syntax, which is supported by most languages including JavaScript, Python, PHP, Ruby, and Java.

How do I validate an email with regex?

Email validation with regex is notoriously tricky. A simple pattern like [^@]+@[^@]+\.[^@]+ catches most cases, but the full RFC 5322 spec is extremely complex. For production, combine a basic regex with a confirmation email.

Can I contribute patterns?

We are working on a community submission feature. In the meantime, contact us with pattern suggestions.