c# - Regex for alphanumeric password, with at least 1 number and character

Question

Need help with a regex for alphanumeric password, with at least 1 number and character, and the length must be between 8-20 characters.

I have this but doesn't seem to be working (it doesn't have length requirements either):

^[A-Za-z0-9]*[A-Za-z][A-Za-z0-9]*$

Answer 1

If you take a look at this MSDN link, it gives an example of a password validation RegEx expression, and (more specifically) how to use it in ASP.NET.

For what you're looking to accomplish, this should work:

    (?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{8,20})$

This requires at least one digit, at least one alphabetic character, no special characters, and from 8-20 characters in length.