Security
Strong Password
Enforce strong passwords: min 8 chars, at least one lowercase, uppercase, digit, and special character.
Try it in RegexProPattern
regexJavaScript
/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^a-zA-Z\d\s]).{8,}$/Raw source: ^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^a-zA-Z\d\s]).{8,}$
How it works
Uses four lookaheads from the start (^) to assert each required character class exists somewhere in the string, then .{8,} ensures minimum length, and $ anchors the end.
Examples
Input
MyP@ssw0rdMatches
MyP@ssw0rd
Input
password123No match
—Input
SHORT1!No match
—Common use cases
- User registration form validation
- Password policy enforcement
- Admin panel access controls
- Security compliance checks