CODEWITHSUNDEEP
c#asp.netregex
Priyank Patel
Priyank Patel

Reputation: 6996

Regular expression to match a password field in Asp.Net

I am using Asp.Net/C#, I am using RegularExpressionValidator to match a password field.My requirement is that I need the user to enter a password which will be atleast 7 characters long and it can contain any combination of alphabets and numeric characters , however it should contain strictly one non-alphanumeric character , can anybody suggest me as to how I can achieve this. Any suggestions are welcome.Thank you

Upvotes: 0

Views: 1665

Answers (3)

Priyank Patel
Priyank Patel

Reputation: 6996

I used the following to match my needs ^([\w]*[(\W)]{1}[\d]*)$ , this allows a password to start with an alphabet any number of times , then the password must contain an non-alphanumeric character only 1 time , followed by a digits any number of times.

Upvotes: 0

stema
stema

Reputation: 92976

Try this

String[] words = { "Foobaar", "Foobar1", "1234567", "123Fooo", "Fo12!", "Foo12!", "Foobar123!", "!Foobar123", "Foo#bar123" };

foreach (String s in words) {

    Match word = Regex.Match(s, @"
          ^                        # Match the start of the string
            (?=                    # positive look ahead
                [\p{L}\p{Nd}]*     # 0 or more letters or digits at the start
                [^\p{L}\p{Nd}]     # string contains exactly one non-digit, non-letter
                [\p{L}\p{Nd}]*     # 0 or more letters or digits after the special character 
            $)                     # till the end of the string
            .{7,}                  # match 7 or more characters
          $                        # Match the end of the string
        ", RegexOptions.IgnorePatternWhitespace);
    if (word.Success) {
        Console.WriteLine(s + ": valid");
    }
    else {
        Console.WriteLine(s + ": invalid");
    }
}
Console.ReadLine();

\p{L} is a unicode code point with the property "letter"

\p{Nd} is a unicode code point with the property "digit"

Upvotes: 3

Robin Maben
Robin Maben

Reputation: 23044

((?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%]).{7,20})


(           # Start of group
  (?=.*\d)      #   must contains one digit from 0-9
  (?=.*[a-z])       #   must contains one lowercase characters
  (?=.*[A-Z])       #   must contains one uppercase characters
  (?=.*[@#$%])      #   must contains one special symbols in the list "@#$%"
              .     #     match anything with previous condition checking
                {7,20}  #        length at least 7 characters and maximum of 20 
)

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Upvotes: 1

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