using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
String s = @"abcde my first line
fghij my second line
klmno my third line";
String mySubstring = "fghij";
Match m = Regex.Match(s, "^" + mySubstring + ".*", RegexOptions.Multiline);
if (m.Success) {
Console.WriteLine(m.Value);
}
}
}
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