Email Validation using Regex

Regular Expressions are very much useful for validation checking. It’s not a new technology; it originated in the UNIX environment, and is commonly used with the Perl language. Regular expressions are, however, supported by a number of .NET classes in the namespace System.Text.RegularExpressions

string email = txtEmail.Text;
Regex regex = new Regex(@”^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$”);
Match match = regex.Match(email);
if (match.Success)
MessageBox.Show(email + ” Correct Format”);
else
MessageBox.Show(email + ” Incorrect Format”);

write  the above code in button click. validation get worked.

i have checked the following email to validate:

Invalid: @majjf.com

Invalid: A@b@c@example.com

Invalid: Abc.example.com

Valid: j..s@proseware.com

Valid: j.@server1.proseware.com

Invalid: js*@proseware.com

Invalid: js@proseware..com

Valid: ma…ma@jjf.co

Valid: ma.@jjf.com

Invalid: ma@@jjf.com

Invalid: ma@jjf.

Invalid: ma@jjf..com

Invalid: ma@jjf.c

Invalid: ma_@jjf

Invalid: ma_@jjf.

Valid: ma_@jjf.com

Invalid: ——-

Valid: 12@hostname.com

Valid: d.j@server1.proseware.com

Valid: david.jones@proseware.com

Valid: j.s@server1.proseware.com

Invalid: j@proseware.com9

Valid: j_9@[129.126.118.1]

Valid: jones@ms1.proseware.com

Invalid: js#internal@proseware.com

Invalid: js@proseware.com9

Invalid: js@proseware.com9

Valid: m.a@hostname.co

Valid: m_a1a@hostname.com

Valid: ma.h.saraf.onemore@hostname.com.edu

Valid: ma@hostname.com

Invalid: ma@hostname.comcom

Invalid: MA@hostname.coMCom

Valid: ma12@hostname.com

Valid: ma-a.aa@hostname.com.edu

Valid: ma-a@hostname.com

Valid: ma-a@hostname.com.edu

Valid: ma-a@1hostname.com

Valid: ma.a@1hostname.com

Valid: ma@1hostname.com

———————————————————

Some Related Validation for your reference

  • Only Number – Validation

Regex regex = new Regex(@”^[0-9]+$”);

Number include decimal point, negative value and comma separator,

Regex regex = new Regex(@”^[0-9,\.-]+$”);

  • Only Alphabets

Regex regex = new Regex(@”^[a-z]+$”);

  • Only AlphaNumberics

Regex regex = new Regex(@”^[0-9a-z]+$”);

in all above if you remove + then its valid for only single character. + is     for multi character validation

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