Regular Expression for Password Validation C#

Question

I want to validate a password using regular expression in c#.

These are the conditions :

1. should not start with digit or special character
2. should n

Answer 1

^(?=.*[A-Za-z])(?=.*[0-9])(?=.*[@#_])[a-zA-Z][\w@#]{6,}[a-zA-Z0-9]$