Regex data annotation validation not working

Question

I'm trying to use the "RegularExpression" DataAnnotation validaiton in my model. My problem is even for the valid input I provide for the field containing the validation, the regex doesn't match and it fails. I try to test the same valid input with the regex in a stand-alone console app and I find it gets through.

My point is, when regex is being used in dataannotation as validation, it considers all input as bad input. What am I missing here?

My regex is for checking comma-seperated email IDs. Here is my model:

 public partial class BuildModel 
{
    public Int64 ConfigID { get; set; }

    [Required(ErrorMessage = "Please select a stream!")]
    public String Name{ get; set; }



    [RegularExpression(@"^(([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)(\s*(;|,)\s*|\s*$))", ErrorMessage = "Please enter valid email IDs separated by commas")]
    public string EmailIDs { get; set; }

   public bool IsActive { get; set; }
}

Note: The "Required" data-annotation validation works just fine. It is just the Regex one, that won't work!

teo van kot · Accepted Answer · 2017-07-17 10:14:46Z

1

As far as i understand you just have problem within your Regex.

To validate emails separated by comma you can use this regex:

^( *[\w+-.%]+@[\w-.]+\.[A-Za-z]{2,4}( *, *)? *)+$

Check in in here.

edited Jul 17, 2017 at 10:14

answered Jul 17, 2017 at 8:35

teo van kot

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4 Comments

Ponni Over a year ago

Turns out this works in my app! I'm still not sure why the original regex would work in a console app but not in my app. Also, the rege that you've provided doesn't allow spaces at the start of each of the e-mail IDs. I need a regex to allow valid comma separated e-mail IDs (and allow spaces at the start or end of the mail IDs!!)

teo van kot Over a year ago

@Ponni i updated regex ant link to allow spaces. About your console app you should show how you use it there. MVC validation uses Regex.IsMatch method under the hood.

Ponni Over a year ago

Thank you. However, this forces my string to have a space after the comma. It needs to be optional. Spaces may/may not be present.

teo van kot Over a year ago

@Ponni it works in both cases. With or without spaces before and after comma

Shahzad Khan · Accepted Answer · 2017-07-17 08:06:36Z

0

You must the jquery.validate.min.js and jquery.validate.unobtrusive.min.js in your page without these libraries required annotation would not works.

answered Jul 17, 2017 at 8:06

Shahzad Khan

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3 Comments

Ponni Over a year ago

yes, they are included, which is why the "Required" validations seems to work. It is just the "Regex" validation that I cannot get to work for some weird reason.

Shahzad Khan Over a year ago

Use the built-en [EmailAddress] attribute, that will works fine.

mack Over a year ago

Thanks. These were loading for me in dev, but not in production.

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