Regex Pattern Library

42 tested regex patterns with one-click copy.

Free & unlimited

Category

Basic email

Matches most common email formats.

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

Strict email (RFC)

Stricter RFC 5322 email validation.

/^[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$/

Disposable email domains

Detect common disposable email providers.

/@(mailinator|guerrillamail|tempmail|throwaway|yopmail)\./gi

US phone

US phone numbers in various formats.

/(?:\+?1[-\s.]?)?$?[2-9]\d{2}$?[-\s.]?\d{3}[-\s.]?\d{4}/g

Phone

UK phone

UK phone numbers.

/(?:\+44|0)\s?[1-9]\d{1,4}\s?\d{3,4}\s?\d{3,4}/g

Phone

E.164 international

International phone in E.164 format.

/\+[1-9]\d{6,14}/g

Phone

Danish phone

Danish 8-digit phone numbers.

/(?:\+45\s?)?\d{2}\s?\d{2}\s?\d{2}\s?\d{2}/g

Phone

HTTP/HTTPS URL

Match HTTP and HTTPS URLs.

/https?://[\w-]+(\.[\w-]+)+(/[\w.,@?^=%&:/~+#-]*)?/gi

URL

URL with optional protocol

URLs with or without http(s)://.

/(?:https?://)?(?:www\.)?[\w-]+(\.[\w-]+)+(/[\w.,@?^=%&:/~+#-]*)?/gi

URL

URL slug

Valid URL slug (lowercase, hyphens).

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

URL

IPv4 address

Valid IPv4 addresses (0.0.0.0 – 255.255.255.255).

/(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.(?:25[0-5]|2[0-4]\d|[01]?\d\d?)/g

IP address

Private IP ranges

Private/internal IP ranges (RFC 1918).

/(?:10\.\d{1,3}\.\d{1,3}\.\d{1,3}|172\.(?:1[6-9]|2\d|3[01])\.\d{1,3}\.\d{1,3}|192\.168\.\d{1,3}\.\d{1,3})/g

IP address

IPv6 address

Full IPv6 addresses.

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

IP address

ISO 8601 date

YYYY-MM-DD format.

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

Date & time

European date

DD/MM/YYYY format.

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

Date & time

US date

MM-DD-YYYY format.

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

Date & time

24h time

HH:MM or HH:MM:SS in 24-hour format.

/(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d)?/g

Date & time

ISO 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})?/g

Date & time

Visa card

Visa card numbers (starts with 4).

/4[0-9]{12}(?:[0-9]{3})?/g

Credit card

Mastercard

Mastercard numbers (starts with 51–55).

/5[1-5][0-9]{14}/g

Credit card

American Express

Amex card numbers (starts with 34 or 37).

/3[47][0-9]{13}/g

Credit card

Danish CPR

Danish personal ID (DDMMYY-XXXX).

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

ID numbers

US SSN

US Social Security Number.

/(?!000|666|9\d{2})\d{3}-(?!00)\d{2}-(?!0000)\d{4}/g

ID numbers

UK NI number

UK National Insurance number.

/[A-CEGHJ-PR-TW-Z]{2}\d{6}[A-D]/gi

ID numbers

UUID v4

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}/gi

ID numbers

US ZIP code

US 5-digit or ZIP+4 format.

/\d{5}(-\d{4})?/g

Postal code

UK postcode

UK postcode format.

/[A-Z]{1,2}\d[A-Z\d]?\s?\d[A-Z]{2}/gi

Postal code

Danish postal code

Danish 4-digit postal code.

/\b\d{4}\b/g

Postal code

German PLZ

German 5-digit postal code.

/\b\d{5}\b/g

Postal code

Alphanumeric username

Letters and numbers only, 3–20 chars.

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

Username

Social handle (@)

Twitter/Instagram-style handle.

/@[a-zA-Z][a-zA-Z0-9_]{1,14}/g

Username

Strong password

Min 8 chars, upper + lower + number + special.

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

Password

HTML tag

Match HTML opening + closing tag pairs.

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

HTML & code

HTML attribute

Extract attribute key-value pairs.

/(\w+)=["']([^"']*)["']/g

HTML & code

Hex color code

CSS hex color (#RGB or #RRGGBB).

/#(?:[0-9a-fA-F]{3}){1,2}\b/g

HTML & code

JS import statement

JavaScript import statements.

/import\s+(?:\{[^}]+\}|\w+)\s+from\s+['"][^'"]+['"]/g

HTML & code

Semantic version

Semantic versioning (major.minor.patch).

/\bv?\d+\.\d+\.\d+(?:-[\w.]+)?(?:\+[\w.]+)?\b/g

HTML & code

Excess whitespace

Two or more consecutive whitespace characters.

/\s{2,}/g

Misc

Duplicate words

Repeated consecutive words.

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

Misc

Number with commas

Numbers with thousand separators.

/\d{1,3}(,\d{3})*(\.\d+)?/g

Misc

Markdown link

Markdown [text](url) links.

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

Misc

JSON key

JSON object keys.

/"(\w+)"\s*:/g

Misc

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About this tool

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2
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3
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