正则表达式在jQuery验证中不起作用

Question

I'm having difficulty getting regular expressions to work with jQuery Validation. Suppose I take a simple regex that requires a minimum of 8 characters to match:

(?=.{8,})

If plug this into a JavaScript-based regular expression tester , it works just fine. 8 or more characters match, 7 or less does not.

Further, if I test this in C# it works as well:

        var regex = new Regex(@"(?=.{8,})");
        if (regex.IsMatch(myInput))
        {
            // Hits this code when myInput >= 8 characters
        }

Next, I use a ValidationAttribute in a view model to emit jQuery Validation to ensure that the user's input matches the expression:

    [RegularExpression(@"(?=.{8,})", ErrorMessage="Does not match.")]
    public string MyInput { get; set; }

At this point, it breaks down. No matter what I type in the field does not match. The HTML emitted is as follows:

    <input data-val="true" data-val-regex="Does not match." 
            data-val-regex-pattern="(?=.{8,})"  id="MyInput" name="MyInput"
            type="text" value="" />

I've tried different regular expressions, to no avail. Is there something different about regular expressions in jQuery Validation that I'm overlooking?

Answer 1

Maybe this works:

RegularExpression(@"^.{8,}$")

Hope this helps. Cheers