using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?<=^#.*\r?\n)#.*$(?!\r?\n#)|(?<!^#.*\r?\n)#.*$(?=\r?\n#)";
string input = @"# line1 <-- startpatern match here
# line2
# line3
# line4 <-- endpatern match here
# line5 <-- no match, since its single line
hi <-- no match
# line6 <-- startpatern match here
# line7 <-- endpatern match here
";
RegexOptions options = 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