带有RegularExpression注释解析错误的电子邮件地址验证

Question

In my attempt to use the RegularExpression annotation to validate an e-mail address I keep getting parse errors in reverse the moment the create page loads. To get the included quotes as part of the regular expression I tried using the unicode so that it would work in Visual Studio. That didn't work either. I tried two quotes as well.

This is the original regex I wanted to use:

(?:[a-z0-9!#$%&' +/=?^_ {|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_ {|}~-]+) |"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f]) ")@(?:(?:a-z0-9?.)+a-z0-9?|[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-] [a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)])

This is the unicode I replaced some of the included quotes with:

"

[Required(ErrorMessage = "User e-mail required.")]
[Display(Name = "E-mail")]
[RegularExpression(@"(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\u0022(?:[\x01 -\x08\x0b\x0c\x0e -\x1f\x21\x23 -\x5b\x5d -\x7f] |\\[\x01-\x09\x0b\x0c\x0e-\x7f])*\u0022)@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])", ErrorMessage = "Invalid format.")]
public string email { get; set; }

How should I be doing this really?

Answer 1

You can go for following code:

[Required(ErrorMessage = "User e-mail required.")]
[Display(Name = "E-mail")]
[EmailAddress(ErrorMessage = "Invalid format.")]
public string email { get; set; }

OR

[Required(ErrorMessage = "User e-mail required.")]
[Display(Name = "E-mail")]
[RegularExpression(@"/^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,4}$/",ErrorMessage = "Invalid format.")]
public string email { get; set; }

Answer 2

REGEXP

^[A-Za-z0-9\x{0430}-\x{044F}\x{0410}-\x{042F}\._-]+@(?:[A-Za-z0-9\x{0430}-\x{044F}\x{0410}-\x{042F}]{1,2}|[A-Za-z0-9\x{0430}-\x{044F}\x{0410}-\x{042F}](?:(?<!(\.\.))[A-Za-z0-9\x{0430}-\x{044F}\x{0410}-\x{042F}.-])+[A-Za-z0-9\x{0430}-\x{044F}\x{0410}-\x{042F}])\.[A-Za-z\x{0430}-\x{044F}\x{0410}-\x{042F}]{2,}$

RESULT

potato@potato.com <== True
test@test.com <== True
test@test@test.com <== False
test@test <= False

See: https://regex101.com/r/yL5M5m/1