MVC 4 - 正则表达式验证 - 为什么这不起作用？

Question

I have a field on an MVC 4 View which requires regular expression validation. I'm trying to limit entry to characters 'A' through 'Z' (case insensitive) only.

My C# property looks as follows:

   /// <summary>
    /// Gets or sets the Revision property
    /// </summary>
    [DataMember]
    [Required]
    [RegularExpression("(/^[a-z]+$/i)", ErrorMessage = "Please enter a character between 'A' and 'Z'")]
    public string Revision { get; set; }

The generated HTML looks as follows:

    <div class="formEditControl">
        <input Style="width:30px;" data-val="true" data-val-regex="Please enter a character between &#39;A&#39; and &#39;Z&#39;" data-val-regex-pattern="(/^[a-z]+$/i)" data-val-required="The Revision field is required." id="Revision" name="Revision" type="text" value="" />
        <span class="field-validation-valid" data-valmsg-for="Revision" data-valmsg-replace="true"></span>
    </div>

But when I execute it, I get the following error on valid data entry:

I don't have a great deal of experience with MVC 4 or RegEx, so it's not clear to me why this isn't working.

Answer 1

You're regular expression is only allowing lowercase characters. Therefore when you input a 'D' it responded with the error. For all letters, case insensitive, your regex should look like this ^[a-zA-Z]*$ . Try that and it should work.

Answer 2

你有(/开头，但这会产生分隔符() 。我不确定你是否甚至需要分隔符。删除(和) 。如果这不起作用，请使用

^[a-zA-Z]+$