using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"<ROW[^<]*?>[^<]*<TO>(?=[^<]*412)[^<]*<\/TO>.*?<\/ROW>";
string input = @"<ROW num=""381"">
<TO>8549672167</TO>
<FROM>8936742582</FROM>
<TIME>5/10/2009 19:49:3</TIME><TEXT>Blah Blah Blah</TEXT>
</ROW>
<ROW num=""382"">
<TO>85496741267</TO>
<FROM>8591903412</FROM>
<TIME>5/10/2009 19:49:37</TIME>
<TEXT>Hme</TEXT>
</ROW>
<ROW num=""381"">
<TO>8549672167412</TO>
<FROM>8936742582</FROM>
<TIME>5/10/2009 19:49:3</TIME><TEXT>Blah Blah Blah</TEXT>
</ROW>";
RegexOptions options = RegexOptions.Singleline | 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