using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"<td>((?:(?!<\/td>).)*)<\/td><td>(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b)<\/td>";
string input = @"<td>over079</td><td>37.123.86.116</td></tr><tr><td>1346968</td><td>rektheace</td><td></td></tr><tr><td>1346967</td><td>rektheace</td><td>173.245.67.214</td>";
foreach (Match m in Regex.Matches(input, pattern))
{
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