var s = "long string.....24X10 .....1X3";
var match = Regex.Match(s, @"d+Xd+");
if (match.Success) {
Console.WriteLine(match.Index); // 16
Console.WriteLine(match.Value); // 24X10;
}
Also take a look at NextMatch
which is a handy function
match = match.NextMatch();
match.Value; // 1X3;
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