Question

Why is my match success equal to false? I have tested the below pattern and input in Regexbuddy and it is successful.

string pattern = @"(?i)(<!-- START -->)(.*?)(?i)(<!-- END -->)";
string input = @"Hello
    <!-- START -->
    is there anyone out there?
    <!-- END -->";

Match match = Regex.Match(input, pattern, RegexOptions.Multiline);
if (match.Success) //-- FALSE!
{
    string found = match.Groups[1].Value;
    Console.WriteLine(found);
}

Answer 1

Try this out

string pattern = @"(?is)(<!-- START -->)(.*?)(<!-- END -->)";
string input = @"Hello
    <!-- START -->
    is there anyone out there?
    <!-- END -->";

Match match = Regex.Match(input, pattern, RegexOptions.None);
if (match.Success) //-- FALSE!
{
    string found = match.Groups[1].Value;
    Console.WriteLine(found);
}

using s option forces your pattern to match . any character including \r and \n.