Regex Pattern Library

Validates standard email addresses

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

Example: user@example.com

E.164 international phone format

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

Example: +14155552671

US phone number formats

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

Example: (415) 555-2671

Matches HTTP and HTTPS URLs

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

Example: https://example.com/path?q=1

Validates IPv4 addresses

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

Example: 192.168.1.1

Full IPv6 address format

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

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

Valid domain names

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

Example: sub.example.com

MAC address with colons or dashes

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

Example: 00:1B:44:11:3A:B7

URL-friendly slug format

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

Example: my-blog-post

Visa, Mastercard, Amex, Discover

^(?: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})$

Example: 4111111111111111

US Social Security Number format

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

Example: 123-45-6789

Min 8 chars, upper, lower, digit, special

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

Example: Str0ng@Pass

JSON Web Token format

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

Example: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxIn0.sig

Hex API key 32-64 characters

^[a-fA-F0-9]{32,64}$

Example: a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4

ISO 8601 date format

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

Example: 2024-01-15

US date format

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

Example: 01/15/2024

24-hour time format

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

Example: 14:30:00

Full ISO 8601 datetime

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

Example: 2024-01-15T14:30:00Z

Match paired HTML tags

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

Example: <div>content</div>

3 or 6 digit hex color

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

Example: #FF5733

SemVer format

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

Example: 1.2.3-beta.1

UUID version 4 format

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

Example: 123e4567-e89b-42d3-a456-426614174000

Simple JSON string key-value pairs

"([^"]+)"\s*:\s*"([^"]*)"

Example: "key": "value"

CSS class selectors

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

Example: .my-class

JavaScript/TypeScript import

^import\s+.*\s+from\s+['"]([^'"]+)['"]

Example: import x from 'module'

String with only whitespace

^\s+$

Example:

String without whitespace

^\S+$

Example: nospaces

Only letters and numbers

^[a-zA-Z0-9]+$

Example: abc123

No digits allowed

^[^\d]+$

Example: Hello World!

Find repeated consecutive words

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

Example: the the

Markdown hyperlink syntax

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

Example: [text](url)

Social media hashtag

#[a-zA-Z0-9_]+

Example: #coding

Twitter/social media mention

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

Example: @username

Positive or negative integer

^-?\d+$

Example: -42

Decimal floating point

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

Example: 3.14

Scientific notation format

^-?\d+\.?\d*[eE][+-]?\d+$

Example: 1.5e10

Percentage value

^\d+(?:\.\d+)?%$

Example: 99.5%

US dollar format

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

Example: $1,234.56

Extract file extension

\.[a-zA-Z0-9]+$

Example: document.pdf

Common image extensions

\.(?:jpg|jpeg|png|gif|bmp|svg|webp)$

Example: photo.jpg

Unix-style file path

^\/(?:[^\/]+\/)*[^\/]+$

Example: /usr/local/bin/node

Windows file path

^[a-zA-Z]:\\(?:[^\\]+\\)*[^\\]+$

Example: C:\Users\file.txt

Base64 encoded string

^[A-Za-z0-9+\/]+={0,2}$

Example: SGVsbG8gV29ybGQ=

32-char hex MD5

^[a-fA-F0-9]{32}$

Example: d41d8cd98f00b204e9800998ecf8427e

64-char hex SHA-256

^[a-fA-F0-9]{64}$

Example: e3b0c44298fc1c149afbf4c8996fb924...