CODEWITHSUNDEEP
regexasp.net-mvc-4
Arvind897
Arvind897

Reputation: 101

Custom Regular expression in model property ASP.NET MVC4

I need to implement a regular expression validation that allows a-z A-z 0-9 and some special characters _ - . @ &

But should restrict 

\ / " : ; * ? " < > { } [ ] ( ) | ! ' % ^

tried this pattern but doesn't work.

[Required]
[Display(Name = "User name")]
[RegularExpression("^[-a-zA-Z0-9_-@]*", ErrorMessage = "Invalid characters!")]
public string UserName { get; set; }

Could you please suggest?

Upvotes: 0

Views: 243

Answers (2)

Rahul Tripathi
Rahul Tripathi

Reputation: 172408

Try this regex:

/^[ A-Za-z0-9-.@&]*$/

REGEX DEMO

If you want to escape hyphen as starting character:

^(?!-)[A-Za-z0-9-.@&]*$

REGEX DEMO

If you want to restrict it from start and end both then try this:

^(?!-)[A-Za-z0-9-.@&]*+(?<!-)$

REGEX DEMO

Upvotes: 1

Braj
Braj

Reputation: 46841

In regex hyphen has a special meaning in Character class that is used to define the range. It should be escaped or put it in the beginning or ending of the set.

Try

[-\w.@&]

Here \w match any word character [a-zA-Z0-9_]

To validate the whole string use ^ and $ to match start and end of the string respectively.

To avoid blank string try + instead of * like ^[-\w.@&]+$

Upvotes: 2

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