Validation

Email Address Validation

Match and validate email addresses in the standard user@domain.tld format.

/[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a…/g

US Phone Number

Match US phone numbers in common formats: (555) 867-5309, 555-867-5309, 5558675309.

/$?\d{3}$?[\s.\-]?\d{3}[\s.\-]?\d{4}/g

Credit Card Number

Match 16-digit credit card numbers with optional spaces or hyphens between groups of 4.

/\b(?:\d{4}[\s\-]?){3}\d{4}\b/g

US ZIP Code

Match US ZIP codes in 5-digit (12345) and ZIP+4 (12345-6789) formats.

/\b\d{5}(?:[\-\s]\d{4})?\b/g

Web

URL Validation

Match http and https URLs with optional www prefix, paths, query strings, and fragments.

/https?:\/\/(?:www\.)?[\w\-]+(?:\.[\w\-…/gi

Hex Color Code

Match CSS hex color codes in both 3-digit (#RGB) and 6-digit (#RRGGBB) formats.

/#(?:[0-9a-fA-F]{6}|[0-9a-fA-F]{3})\b/g

URL Slug

Validate URL slugs: lowercase letters and digits separated by single hyphens, no leading/trailing hyphens.

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

HTML Tag Matcher

Match paired HTML tags and capture the tag name and inner content using a back-reference.

/<([a-zA-Z][a-zA-Z0-9]*)\b[^>]*>([\s\S]…/g

Networking

IPv4 Address

Match valid IPv4 addresses with each octet constrained to 0–255.

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

Dates & Times

ISO 8601 Date

Match dates in ISO 8601 format: YYYY-MM-DD with valid month (01–12) and day (01–31) ranges.

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

US Date Format (MM/DD/YYYY)

Match US-style dates in MM/DD/YYYY format with range validation.

/(?:0[1-9]|1[0-2])\/(?:0[1-9]|[12]\d|3[…/g

Security

Strong Password

Enforce strong passwords: min 8 chars, at least one lowercase, uppercase, digit, and special character.

/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^…/

Identifiers

UUID (v1–v5)

Match RFC 4122 UUIDs (versions 1–5) in the standard 8-4-4-4-12 hex format.

/[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{…/gi

Semantic Version (SemVer)

Match semantic version strings like 1.2.3, 1.2.3-beta.1, or 1.2.3+build.42.

/(?:0|[1-9]\d*)\.(?:0|[1-9]\d*)\.(?:0|[…/g

Text Processing

Markdown Link

Match Markdown links [link text](url) and capture both the display text and the URL.

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

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