using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^([^\W_][\w\-\.]*[^\W_])(@[^\W_][a-zA-Z0-9\-]+[^\W_])(\.[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)?[^\W_])$";
string input = @"// User tests
abc@test.test
123@test.test
abc123@test.test
abc.123@test.test
abc-123@test.test
abc_123@test.test
abc.123-def@test.test
abc.123_def@test.test
abc-123_def@test.test
// Domain tests
test@abc.test
test@123.test
test@abc-123.test
// TLD tests
test@test.com
test@test.com.br
//Invalid space tests
test@test.test
te st@test.test
test @test.test
test@ test.test
test@te st.test
test@test .test
test@test. test
test@test.te st
test@test.test
//Invalid user tests
.abc123@test.test
abc123.@test.test
-abc123@test.test
abc123-@test.test
_abc123@test.test
abc123_@test.test
//Invalid domain tests
test@.abc123.test
test@abc123..test
test@-abc123.test
test@abc123-.test
test@_abc123.test
test@abc_123.test
test@abc123_.test
//Invalid TLD tests
test@test.abc.
test@test.-abc
test@test.ab-c
test@test.abc-
test@test._abc
test@test.ab_c
test@test.abc_";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx