Email Address
Identity & ContactValidates email addresses
^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$Example matches
Regex Library
All Regex Patterns
Browse every regex pattern published on DuskTools in one crawlable index. Each destination page includes the raw expression, matching and non-matching examples, a breakdown of how the pattern works, and links into the regex tester when you want to adapt it for production use.
This hub is designed for discovery: compare adjacent patterns, jump straight into validation use cases like JWTs or semantic versions, and follow related links into CSS and JavaScript reference content without losing context.
Pattern pages
15
Pattern categories
6
Interactive helpers
3
Start With These Tools
Identity & Contact
Patterns for emails, phone numbers, and other user-facing identifiers.
US Phone Number
Identity & ContactUS phone number formats
^\+?1?[\s.-]?\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4}$Example matches
(555) 123-4567+1 555.123.4567Web & Routing
Common expressions for URLs, HTML fragments, and slug-like paths.
URL
Web & RoutingMatches HTTP/HTTPS URLs
https?:\/\/[\w\-]+(\.[\w\-]+)+[\w\-.,@?^=%&:/~+#]*Example matches
https://example.comhttp://sub.domain.com/pathHTML Tag
Web & RoutingMatches HTML tags
<\/?[a-zA-Z][a-zA-Z0-9]*(?:\s[^>]*)?\/?>Example matches
<div><img src='x' />URL Slug
Web & RoutingURL-friendly slugs
^[a-z0-9]+(?:-[a-z0-9]+)*$Example matches
hello-worldmy-post-123Network & Infrastructure
Copy-ready validators for IP addresses and hardware-oriented network formats.
IPv4 Address
Network & InfrastructureValidates IPv4 addresses
^(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)$Example matches
192.168.1.110.0.0.1MAC Address
Network & InfrastructureNetwork MAC address
^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$Example matches
00:1A:2B:3C:4D:5E00-1A-2B-3C-4D-5EIPv6 Address
Network & InfrastructureFull IPv6 address
^([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$Example matches
2001:0db8:85a3:0000:0000:8a2e:0370:7334Security & Validation
Formats that frequently show up in auth, payments, and input validation flows.
Strong Password
Security & ValidationAt least 8 chars, uppercase, lowercase, number, special char
^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$Example matches
P@ssw0rd!Str0ng!PassUUID
Security & ValidationUUID format (any version)
^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$Example matches
550e8400-e29b-41d4-a716-446655440000Credit Card Number
Security & ValidationVisa, Mastercard, or Amex
^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13})$Example matches
41111111111111115500000000000004JWT Token
Security & ValidationJSON Web Token format (header.payload.signature)
^[A-Za-z0-9_-]+\.[A-Za-z0-9_-]+\.[A-Za-z0-9_-]+$Example matches
eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0.abc123Data Formats
Structured formats developers validate in APIs, config files, and release pipelines.
ISO Date
Data FormatsISO 8601 date format (YYYY-MM-DD)
^\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])$Example matches
2024-01-152023-12-31Semantic Version
Data FormatsSemantic versioning (major.minor.patch)
^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?$Example matches
1.0.02.3.4-beta.1Design & Frontend
Frontend-friendly patterns useful in styling, theming, and UI tooling.
Hex Color Code
Design & Frontend3 or 6 digit hex color codes
^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$Example matches
#ff0000#FFFContinue Exploring
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