edit: LINQ Awesomeness

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==Code
{{
static void TestCoolness(string test)
{
	Console.WriteLine(new string('-', test.Length));
	Console.WriteLine(test);
	Console.WriteLine(new string('-', test.Length));

const string Pattern = @"(?xn)
	\s*                    # match this so we can easily find invalid text
	(
	  (?<v>[^',]+)         # either capture an unquoted token
	  |
	  '(?<v>([^']|'')+)'   # or the quoted token, without the (unescaped) quotes
	)
	\s*                    # ditto above \s*
	(
	  ,|$                  # a token is terminated by a comma (outside a quoted 
	                       #   string) or the end of the string
	)";

var matches = Regex.Matches(test, Pattern).Cast<Match>();

if (matches.Sum(m => m.Length) == test.Length)
		Console.WriteLine(matches
			.Select(m => m.Groups["v"].Value.Replace("''", "'"))
			.Join("\n"));
	else
		Console.Error.WriteLine(
			"! {0}\n! {1}",
			test,
			Enumerable.Range(0, test.Length)
				.GroupJoin(
					matches.SelectMany(m => Enumerable.Range(m.Index, m.Length)), 
					n => n, n => n,
					(n, g) => g.Any() ? " " : "^")
				.Join(""));
}
}}
==Input
{{
TestCoolness("a,b,c");
TestCoolness("a, 'b','c, still c'' yes, even still c'");
TestCoolness("a,'b,c");
TestCoolness("a,b,c'");
TestCoolness("'   ' 'a,b,c'");
}}
==Output
{{
-----
a,b,c
-----
a
b
c
---------------------------------------
a, 'b','c, still c'' yes, even still c'
---------------------------------------
a
b
c, still c' yes, even still c
------
a,'b,c
------
! a,'b,c
!   ^
------
a,b,c'
------
! a,b,c'
!     ^^
-------------
'   ' 'a,b,c'
-------------
! '   ' 'a,b,c'
! ^^^^^
}}

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