Regexp Password Validation

regexp-password.md

Minimum eight characters, at least one letter and one number:

^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$

Minimum eight characters, at least one letter, one number and one special character:

^(?=.*[A-Za-z])(?=.*\d)(?=.*[@$!%*#?&])[A-Za-z\d@$!%*#?&]{8,}$

Minimum eight characters, at least one uppercase letter, one lowercase letter and one number:

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$

Minimum eight characters, at least one uppercase letter, one lowercase letter, one number and one special character:

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$

Minimum eight and maximum 10 characters, at least one uppercase letter, one lowercase letter, one number and one special character:

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,10}$

With Description

You may use this regex with multiple lookahead assertions (conditions):

^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[#?!@$%^&*-]).{8,}$

This regex will enforce these rules:

• At least one upper case English letter, (?=.*?[A-Z])
• At least one lower case English letter, (?=.*?[a-z])
• At least one digit, (?=.*?[0-9])
• At least one special character, (?=.?[#?!@$%^&-])
• Minimum eight in length .{8,} (with the anchors)

Ref: https://stackoverflow.com/a/21456918