Password validation in c#

Question

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HI all

I have validate password. password length should be min 6 and should contain atleast one digit and atleast one alphabet.

Please help me out

I have tried following function but it fails

C#

public bool CheckPassword(string password)
        {
            //string MatchEmailPattern = "(?=.{6,})[a-zA-Z0-9]+[^a-zA-Z]+|[^a-zA-Z]+[a-zA-Z]+";
            string MatchEmailPattern = "^[a-zA-Z0-9]+$";

                if (password != null) return Regex.IsMatch(password, MatchEmailPattern);
                else return false;


        }

Posted 19-Apr-12 23:58pm

Pravinjas

Updated 30-May-18 7:56am

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Comments

Dhanushka Madushan lk 20-Apr-12 6:13am

check this
http://www.codeproject.com/Articles/367001/Introduction-to-ASP-NET-validation

3 solutions

Solution 1

Please refer this answer[^]-Regular Expressions for password

Posted 20-Apr-12 0:00am

Prasad_Kulkarni

Solution 2

(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{6,15})$
This requires at least one digit, at least one alphabetic character, no special characters, and from 6-15 characters in length.

take a look for
http://www.regular-expressions.info/reference.html[^]

http://msdn.microsoft.com/en-us/library/ms998267.aspx[^]

Posted 20-Apr-12 0:20am

Saroj Kumar Sahu

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VJ Reddy · Accepted Answer · 2012-04-20T01:40:00

Solution 3

The following regular expression can be used to match a string whose length is at least 6, contains at least one digit and contains at least one lower case or upper case alphabet

(?=^.{6,}$)(?=.*\d)(?=.*[a-zA-Z])

However, I think it is good idea to avoid spaces in the string, in which case the following regular expression can be used

(?=^[^\s]{6,}$)(?=.*\d)(?=.*[a-zA-Z])

It can be tested on line here
http://regexhero.net/tester/[^]

Posted 20-Apr-12 1:40am

VJ Reddy

Comments

Pravinjas 20-Apr-12 8:39am

Thanks...

VJ Reddy 20-Apr-12 10:33am

You're welcome and thank you for the response.

Sergey Alexandrovich Kryukov 22-Apr-12 21:38pm

Answered, a 5.
--SA

VJ Reddy 22-Apr-12 21:48pm

Thank you, SA.