Databases
StackOverflow2013
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    <p>I found nice document on MSDN for it.</p> <p>How to: Verify that Strings Are in Valid Email Format <a href="http://msdn.microsoft.com/en-us/library/01escwtf.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/01escwtf.aspx</a> (check out that this code also supports the use of non-ASCII characters for Internet domain names.)</p> <p><strong>There are 2 implementation, for .Net 2.0/3.0 and for .Net 3.5 and higher.<br> the 2.0/3.0 version is:</strong></p> <pre><code>bool IsValidEmail(string strIn) { // Return true if strIn is in valid e-mail format. return Regex.IsMatch(strIn, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"); } </code></pre> <p><strong>My tests over this method give:</strong></p> <pre><code>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 </code></pre>
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    1. USmr.baby123
    1. USmr.baby123
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    1. CODoesn't match `[me]@whatever.museum`
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      1. USToto
    2. COInvalid: Abc.example.com YES, that works correctly, however, this "toms.email.@gmail.com"; does not work
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      1. USTom Stickel
    3. COHad to add a plus sign: ` @"^([\w-\.+]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$" ` 11 the char left on ] Google and hotmail aliassing allow for plus sign in first section before @ sign.
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      1. USHenk J Meulekamp
 

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