CODEWITHSUNDEEP
asp.netregexvalidation
ComfortablyNumb
ComfortablyNumb

Reputation: 1456

How to include a regular expression in a custom validator using c#

I'm using custom validators so I can style textboxes. However, I'm unsure how to validate an email address - possibly using a regex expression? Here's the code I'm trying to adapt:

protected void CustomValidatorBillEmail_ServerValidate(object sender, ServerValidateEventArgs args)
    {
        bool is_valid = txtBillingEmail.Text != "";
        txtBillingEmail.BackColor = is_valid ? System.Drawing.Color.White : System.Drawing.Color.LightPink;
        args.IsValid = is_valid;
    }

Any help, as always, would be greatly appreciated.

Upvotes: 2

Views: 8042

Answers (2)

ComfortablyNumb
ComfortablyNumb

Reputation: 1456

Here's my solution:

protected void CustomValidatorBillEmail_ServerValidate(object sender, ServerValidateEventArgs args)
    {
        string strRegex = @"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
         @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
         @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$";

        Regex regex = new Regex(strRegex);

        bool is_valid = false;

        if (regex.IsMatch(txtBillingEmail.Text))
        { 
            is_valid = true; 
        }

        txtBillingEmail.BackColor = is_valid ? System.Drawing.Color.White : System.Drawing.Color.LightPink;
        args.IsValid = is_valid;
    }

Can it be improved? Need to learn!!

Upvotes: 2

Robb
Robb

Reputation: 86

.Net framework comes with a RegEx class (System.Text.RegularExpressions) which you would then supply with a regular expression to verify the email there are 100's of versions on the net.

Upvotes: 1

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