simify HereDocumentExtension.cs

HereDoc.cs

/// <summary>
/// [Rules]
/// - all of lines (except first) require same indent
/// 		* indent = mix of tab and space is ok
/// - first line requires empty (only line break)
/// 		* linebreak = CR+LF or LF
///
/// [SpecialThanks]		
/// this code is inspired by sayurin's code (http://git.io/iE1MhA)
/// 
/// [Usage]
/// var x = @"
/// 			test
/// 				test".AsHereDocSimpleType2();
/// var x = @"
/// 			test
/// 				test
/// 			".AsHereDocSimpleType2();
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static string AsHereDocSimpleType2(this string input)
{			
	return Regex.Replace(input,
	                    @"^(?<sep>\r?\n)(?<indent>[ \t]*)((?<text>[^\r\n]*)\k<sep>\k<indent>)*(?<text>[^\r\n]+)?$",
	                     m => string.Join(
	                    	m.Groups["sep"].Value,
	                    	m.Groups["text"].Captures.Cast<Capture>().Select(c => c.Value)));
}