Regex password issue [duplicate] - regex

Question

This question already has answers here:
Regexp Java for password validation
(17 answers)
Closed 8 years ago.
Working on a project where it requires me to have a password field using pattern attribute.
Not really done a lot of regex stuff and was wondering whether someone could help out.
The requirements for the field are as follows:
Can't contain the word "password"
Must be 8-12 in length
Must have 1 upper case
Must have 1 lower case
Must have 1 digit
Now, so far I have the following:
[^(password)].(?=.*[0-9])?=.*[a-zA-Z]).{8,12}
This doesn't work. We can get it so everything else works, apart from the password string being matched.
Thanks in advance,
Andy
EDIT: the method we've used now (nested in comments below) is:
^(?!.*(P|p)(A|a)(S|s)(S|s)(W|w)(O|o)(R|r)(D|d)).(?=.*\d)(?=.*[a-zA-Z]).{8,12}$
Thanks for the help

Answer 1

Use a series of anchored look aheads for the :must contain" criteria:
^(?!.*(?i)password)(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,12}$
I've added the "ignore case" switch (?i) to the "password" requirement, so it will reject `the word no matter the case of the letters.

Answer 2

This regex should to the job:
^(?!.*password)(?=.*\d)(?=.*[A-Z])(?=.*[a-z]).{8,12}$
it will match:
^ // from the beginning of the input
(?!.*password) // negative lookbehind whether the text contains password
(?=.*\d+) // positive lookahead for at least one digit
(?=.*[A-Z]+) // positive lookahead for at least one uppercase letter
(?=.*[a-z]+) // positive lookahead for at least one lowercase letter
.{8,12} // length of the input is between 8 and 12 characters
$
Link to phpliveregex

Answer 3

Try This:
^(?!.*password)(?=.*[A-Z])(?=.*[0-9])(?=.*[a-z]).{8,12}$
Explanation
^ Start anchor
(?=.*[A-Z]) Ensure string has one uppercase letter
(?=.*[0-9]) Ensure string has one digits.
(?=.*[a-z]) Ensure string has one lowercase letter
{8,12} Ensure string is of length 8 - 12.
(?!.*password) Not of word password
$ End anchor.

Answer 4

Try this way
Public void validation()
string xxxx = "Aa1qqqqqq";
if (xxxx.ToUpper().Contains("password") || !(xxxx.Length <= 12 & xxxx.Length >= 8) || !IsMatch(xxxx, "(?=.*[A-Z])") || !IsMatch(xxxx, "(?=.*[a-z])") || !IsMatch(xxxx, "(?=.*[0-9])"))
{
throw new System.ArgumentException("Your error message here", "Password");
}
}
public bool IsMatch(string input, string pattern)
{
Match xx = Regex.Match(input, pattern);
return xx.Success;
}