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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		var regex = new Regex(@"^(?P<delim>\.)     # delimiter "."
                        (?P<root>\w+)$    # Root Symbol, at least 1 character
                        )", RegexOptions.IgnorePatternWhitespace);
	}
}

prog.cs(11,60): error CS1010: Newline in constant
prog.cs(12,34): error CS1009: Unrecognized escape sequence `\w'
prog.cs(12,34): error CS1009: Unrecognized escape sequence `\w'
prog.cs(12,34): error CS1009: Unrecognized escape sequence `\w'
prog.cs(12,25): error CS1041: Identifier expected, `?' is a keyword
prog.cs(12,34): error CS1009: Unrecognized escape sequence `\w'
prog.cs(12,35): error CS1001: Unexpected symbol `)', expecting identifier
prog.cs(12,37): error CS1056: Unexpected character `$'
prog.cs(12,42): error CS1040: Preprocessor directives must appear as the first non-whitespace character on a line
prog.cs(12,59): error CS1001: Unexpected symbol `least', expecting identifier
prog.cs(13,66): error CS1010: Newline in constant
Compilation failed: 11 error(s), 0 warnings

Standard output is empty