Email address validation in C MVC 4 application with or without using Regex

Question

I have an MVC 4 web application and I need to enter and validate some email addresses  without sending an email to the user s email address   Currently I am using basic regex email validation with this pattern    RegularExpression    A    a-z0-9     amp              -        a-z0-9     amp              -         a-z0-9     a-z0-9-   a-z0-9        a-z0-9     a-z0-9-   a-z0-9     Z           ErrorMessage    Please enter correct email address      Although this is validating email addresses  it passes 1 1 1 as a valid email address  For the moment I have a validation that requires symbols   symbols   symbols where the symbols can be numeric alphabetic and   -      I need more standard email validation for my MVC 4 application  How do I do that

User · Answer

Regex    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           ErrorMessage    Please enter a valid e-mail adress      Or you can use just        DataType DataType EmailAddress       public string Email   get  set

User · Answer

Why not just use the EmailAttribute    Email ErrorMessage    Bad email    public string Email   get  set

User · Answer

Don t   Use a regex for a quick sanity check  something like       but almost all langauges   frameworks have better methods for checking an e-mail address  Use that     It is possible to validate an e-mail address with a regex  but it is a long regex  Very long  And in the end you will be none the wiser  You ll only know that the format is valid  but you still don t know if it s an active e-mail address  The only way to find out  is by sending a confirmation e-mail

User · Answer

You need a regular expression for this  Look here  If you are using  net Framework4 5 then you can also use this  As it is built in  net Framework 4 5   Example   EmailAddress ErrorMessage    Invalid Email Address    public string Email   get  set

User · Answer

It is surprising the question of validating an email address continually comes up on SO   You can find one often-mentioned practical solution here  How to Find or Validate an Email Address   Excerpt      The virtue of my regular expression above is that it matches 99  of   the email addresses in use today  All the email address it matches can   be handled by 99  of all email software out there  If you re looking   for a quick solution  you only need to read the next paragraph  If you   want to know all the trade-offs and get plenty of alternatives to   choose from  read on    See this answer on SO for a discussion of the merits of the article at the above link  In particular  the comment dated 2012-04-17 reads      To all the complainers  after 3 hours experimenting all the solutions   offered in this gigantic discussion  this is THE ONLY good java regex   solution I can find  None of the rfc5322 stuff works on java regex

User · Answer

Expanding on Ehsan s Answer      If you are using  Net framework 4 5 then you can have a simple method to verify email address using EmailAddressAttribute Class in code    private static bool IsValidEmailAddress string emailAddress        return new System ComponentModel DataAnnotations                          EmailAddressAttribute                            IsValid emailAddress       If you are considering REGEX to verify email address then read    I Knew How To Validate An Email Address Until I Read The RFC By Phil Haack

[c#] Email address validation in C# MVC 4 application: with or without using Regex

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