Password Regex For Specific Requirements

I am to write a regex for following requirements At least one character At least one digit Length must be of 8 At least one special character(Can be any special character) First

Solution 1:

You can solve these with a combination of lookaheads:

1. (?=.*[a-zA-Z])
2. (?=.*\d)
3. .{8}
4. (?=.*[^\da-zA-Z])

The last one just requires a non-letter and non-digit which is probably by far the easiest way of specifying that you want a somewhat “special” character.

So in the end you have

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