Password Strength Regex Tester
Validate password requirements with regular expressions
^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$Regex Flags
No matches found
Pattern Explanation
^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$No explanation available
About Password Regex Patterns
Password validation traditionally uses regex to enforce complexity requirements: minimum length, uppercase letters, numbers, and special characters. While security experts debate these rules, many applications still require them for compliance.
Our password regex tester helps you build and test patterns that match your security policy requirements while balancing user experience.
Why Validate Passwords?
Clear password requirements improve both security and UX. When users understand what's needed upfront, they create compliant passwords without frustrating error loops.
Regex-based validation provides immediate feedback as users type, showing which requirements are met and which still need attention. This real-time feedback dramatically improves form completion rates.
Building the Pattern
Password regex uses lookaheads for multiple requirements:
• (?=.*[a-z]) requires lowercase • (?=.*[A-Z]) requires uppercase • (?=.*\d) requires digit • (?=.*[@$!%*?&]) requires special character • .{8,} requires minimum length
Combine lookaheads at the pattern start, then match the full string.
Common Use Cases
- User registration forms
- Password change functionality
- Admin account creation
- Compliance requirement enforcement
Pro Tip
Modern guidance (NIST) recommends length over complexity. Consider requiring 12+ characters without complexity rules—passphrases are more secure and memorable than P@ssw0rd!
Other Regex Patterns
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