CODEWITHSUNDEEP
.netregexasp.net-mvc-4
user1589906
user1589906

Reputation:

Regular Expression validator not working in ASP.NET MVC 4

I'm new to .net and I'm stuck with a problem I want to validate my password field ,The password must be a alphanumericstring with special symbols and I wrote a code for that which is given below

[Required(ErrorMessage = "Password is required")]
[RegularExpression(@"^[a-zA-Z0-9~!@#$%^&*]{8,15}$", ErrorMessage = "Password is not in proper format")]
public virtual string Password { get; set; }

But its not working if the password length is greater than 8 then its gives green signal for the string even its only contain alphabets. How can I overcome this problem

Upvotes: 0

Views: 2878

Answers (3)

Anirudha
Anirudha

Reputation: 32797

You can use this regex

^(?=.*[a-zA-Z\d])(?=.*[~!@#$%^&*])[a-zA-Z\d~!@#$%^&*]{8,15}$
 ---------------- -----------------
    |            |->match further only if there's any one of [~!@#$%^&*]
    |-> match further only if there's any one of [a-zA-Z0-9]

Upvotes: 2

stema
stema

Reputation: 92976

You can use positive lookahead assertions to ensure certain conditions on your string:

[RegularExpression(@"(?=.*[a-zA-Z0-9])(?=.*[~!@#$%^&*])[a-zA-Z0-9~!@#$%^&*]{8,15}", ErrorMessage = "Password is not in proper format")]

When you use the Regular Expression validator, you don't need anchors, the regex is automatically matched against the whole input string.

(?=.*[a-zA-Z0-9]) is checking from the start of the string, that there is a letter or a digit somewhere in the string.

(?=.*[~!@#$%^&*]) is checking from the start of the string, that there is a special character somewhere in the string.

[a-zA-Z0-9~!@#$%^&*]{8,15} is then actually matching the string, allowing only the allowed characters.

Upvotes: 0

Jochen van Wylick
Jochen van Wylick

Reputation: 5401

The thing is - right now you're just checking for a string with length 8 to 15 that is made up out of these characters. If you want to make sure you have at least one special character, you need something like [!@#$%^&*]+.

Upvotes: 0

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