Regex Pattern Library

Collection of common, tested regular expression patterns for validation and matching.

Email & Communication

Email Address

Matches standard email addresses

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

Example: user@example.com

Email & Communication

Simple Email

Basic email validation (less strict)

\S+@\S+\.\S+

Example: test@domain.org

URLs & Web

URL

Matches 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/path

URLs & Web

Domain Name

Valid domain names

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

Example: example.com

Phone Numbers

US Phone Number

US phone numbers with various formats

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

Example: (555) 123-4567

Phone Numbers

International Phone

International phone format (E.164)

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

Example: +1234567890

Numbers & Currency

Integer

Positive or negative whole numbers

^-?\d+$

Example: -123, 456

Numbers & Currency

Decimal Number

Decimal numbers (floats)

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

Example: 3.14159, -0.5

Numbers & Currency

Currency

Currency amounts with optional commas

^\$?([0-9]{1,3},([0-9]{3},)*[0-9]{3}|[0-9]+)(\.[0-9][0-9])?$

Example: $1,234.56

Dates & Time

US Date (MM/DD/YYYY)

US date format validation

^(0[1-9]|1[0-2])\/(0[1-9]|[12][0-9]|3[01])\/(19|20)\d\d$

Example: 12/25/2023

Dates & Time

ISO Date (YYYY-MM-DD)

ISO 8601 date format

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

Example: 2023-12-25

Dates & Time

24-Hour Time

24-hour time format

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

Example: 14:30

Network

IPv4 Address

Valid 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

Network

IPv6 Address

Valid IPv6 addresses (simplified)

^(?:(?:[a-fA-F\d]{1,4}:){7}(?:[a-fA-F\d]{1,4}|:)|(?:[a-fA-F\d]{1,4}:){6}(?:(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)(?:\.(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)){3}|:[a-fA-F\d]{1,4}|:)|...)$

Example: 2001:0db8:85a3::8a2e:0370:7334

Financial

Credit Card

Major credit card formats

^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|6(?:011|5[0-9]{2})[0-9]{12}|(?:2131|1800|35\d{3})\d{11})$

Example: 4532015112830366

Security

Strong Password

Min 8 chars, upper, lower, number, special

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

Example: MyP@ssw0rd

User Data

Username

Alphanumeric, 3-16 chars

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

Example: john_doe123

User Data

URL Slug

SEO-friendly URL slugs

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

Example: my-blog-post

Colors

Hex Color

Hex color codes

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

Example: #FF5733, #FFF

Colors

RGB Color

RGB color format

^rgb$(\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3})$$

Example: rgb(255, 87, 51)

File Paths

Filename

Valid filenames with extension

^[^\<>":/\\|?*\x00-\x1f]+\.[a-zA-Z0-9]{1,6}$

Example: document.pdf

File Paths

File Path

Windows/Unix file paths

^(?:[a-zA-Z]:)?\\?(?:[^\\<>":|?*\x00-\x1f]+\\?)*[^\\<>":|?*\x00-\x1f]+$

Example: /home/user/file.txt

Social Media

Twitter/X Handle

Twitter/X username

^@?[a-zA-Z0-9_]{1,15}$

Example: @username

Social Media

Hashtag

Social media hashtags

^#?[a-zA-Z0-9_]+$

Example: #javascript

IDs

UUID v4

UUID version 4 format

^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$

Example: 550e8400-e29b-41d4-a716-446655440000

Code

HTML Tag

Matches HTML tags

<\/?[\w\s="'&:;#]+\/?>

Example: <div class='test'>

Code

CSS Class

CSS class selectors

\.[a-zA-Z_-][a-zA-Z0-9_-]*

Example: .my-class

How to Use

Click the copy button on any pattern to copy it to your clipboard. These patterns can be used in:

JavaScript

const regex = /pattern/;
regex.test(string);

Python

import re
re.match(r'pattern', string)

Regex Pattern Library

JavaScript

Python

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