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Use RegularExpression to enforce strong password

I came across to a post by Anil John talking about how to enforce password complexity by using regular expresion. Here is the regular expression he wrote: ^.*(?=.{10,})(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=]).*$ What it enforces is: Must be at least 10 characters Must contain at least one one lower case letter, one upper case letter, one digit and one special character Valid special characters are –   @#$%^&+= This regular expression can be easily used for the RegularExpressValidator control in ASP.NET, and […]