using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?<=^|\s)(?:\w?'?)(@(\S+))";
string input = @"1. take this -> @Mark
2. take this -> @mark_2
3. take this -> @中国
4. take this -> l'@antro
5. don't take this -> 中国@中国.zh
6. don't take this -> 中国@google.zh
7. don't take this -> info@google.com
8. don't take this -> 99@test.com";
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