asp.net mvc custom regular expression validation for both of server-side and client-side

server-side:

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public class OneDigitAttribute : RegularExpressionAttribute, IClientValidatable     {         public OneDigitAttribute()             : base(@"^.*(?=.*\d).+$")         {             ErrorMessage = "Required at least one numeric digit";         }           // for supporting a client-side validation through jquery.validation.unobtrusive         public IEnumerable<modelclientvalidationrule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)         {             yield return new ModelClientValidationRegexRule(this.ErrorMessage, this.Pattern)             {                 ValidationType = "onedigit"             };         }     } </modelclientvalidationrule>

then, you can use the attribute

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...   [OneDigit] [DataType(DataType.Password)] public string Password { get; set; } ....

client-side :

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$.validator.addMethod("onedigit", function (value, element, regexp) {     var re = new RegExp(regexp); return re.test(value); }); jQuery.validator.unobtrusive.adapters.addSingleVal("onedigit", "pattern");