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Browse a searchable library of 30+ commonly used regex patterns organized by category. Each pattern includes a description, examples, and a live test area to try with your own text.
Follow these simple steps to get instant, accurate results directly in your browser:
Explore validation categories: Web & Network, User & Auth, Numbers & Finance, and Dates.
Review the regex string, explanation of capture groups, and sample matching values.
Click 'Copy Pattern' or send the expression directly to the interactive Regex Tester.
The Regex Pattern Library is a curated repository of production-tested regular expressions for common software development validation and text parsing tasks.
Writing regular expressions from scratch can be prone to catastrophic backtracking (ReDoS) or subtle edge-case failures. Our library provides vetted patterns for email addresses (RFC 5322), strong passwords, phone numbers (international and US format), URLs, IPv4 and IPv6 addresses, credit card numbers, slugs, and date formats.
Each pattern includes an explanation of tokens, test case examples, and a one-click copy button to paste directly into your frontend or backend validation logic.
Curated collection covering emails, URLs, IP addresses, dates, and passwords.
Includes examples of strings that pass and fail for easy verification.
One-click handoff to test and modify any pattern in the interactive tester.
Openly accessible documentation with zero paywalls or registration.
Drop vetted patterns into HTML5 pattern attributes or form validation schemas (Zod, Yup).
Validate incoming user registration inputs before executing database queries.
Use audited expressions designed to avoid catastrophic backtracking security flaws.
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