using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @/
.*Disconnected from (invalid |authenticating )?user .* [^ ]+ port [0-9]+( \[preauth\])?$
/;
string input = @"Jan 17 08:49:00 thesquareplanet.com sshd[2744]: Disconnected from invalid user wp-user 89.134.42.194 port 38866 [preauth]
Jan 17 03:13:00 thesquareplanet.com sshd[2631]: Disconnected from invalid user Disconnected from 46.97.239.16 port 55920 [preauth]
Jan 17 10:00:29 thesquareplanet.com sshd[2775]: Disconnected from user jon 18.26.4.53 port 39872";
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