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    <p>Ah, RegEx. Now you have two problems. ;)</p> <p>I'd use a tokenizer/parser, since it is quite straightforward, and more importantly, much easier to read for later maintenance.</p> <p>This works, for example:</p> <pre><code>using System; using System.Collections; using System.Collections.Generic; using System.IO; using System.Text; class Program { static void Main(string[] args) { string myString = "cat,dog,\"0 = OFF, 1 = ON\",lion,tiger,'R = red, G = green, B = blue',bear"; Console.WriteLine("\nmyString is ...\n\t" + myString + "\n"); CsvParser parser = new CsvParser(myString); Int32 lineNumber = 0; foreach (string s in parser) { Console.WriteLine(lineNumber + ": " + s); } Console.ReadKey(); } } internal enum TokenType { Comma, Quote, Value } internal class Token { public Token(TokenType type, string value) { Value = value; Type = type; } public String Value { get; private set; } public TokenType Type { get; private set; } } internal class StreamTokenizer : IEnumerable&lt;Token&gt; { private TextReader _reader; public StreamTokenizer(TextReader reader) { _reader = reader; } public IEnumerator&lt;Token&gt; GetEnumerator() { String line; StringBuilder value = new StringBuilder(); while ((line = _reader.ReadLine()) != null) { foreach (Char c in line) { switch (c) { case '\'': case '"': if (value.Length &gt; 0) { yield return new Token(TokenType.Value, value.ToString()); value.Length = 0; } yield return new Token(TokenType.Quote, c.ToString()); break; case ',': if (value.Length &gt; 0) { yield return new Token(TokenType.Value, value.ToString()); value.Length = 0; } yield return new Token(TokenType.Comma, c.ToString()); break; default: value.Append(c); break; } } // Thanks, dpan if (value.Length &gt; 0) { yield return new Token(TokenType.Value, value.ToString()); } } } IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); } } internal class CsvParser : IEnumerable&lt;String&gt; { private StreamTokenizer _tokenizer; public CsvParser(Stream data) { _tokenizer = new StreamTokenizer(new StreamReader(data)); } public CsvParser(String data) { _tokenizer = new StreamTokenizer(new StringReader(data)); } public IEnumerator&lt;string&gt; GetEnumerator() { Boolean inQuote = false; StringBuilder result = new StringBuilder(); foreach (Token token in _tokenizer) { switch (token.Type) { case TokenType.Comma: if (inQuote) { result.Append(token.Value); } else { yield return result.ToString(); result.Length = 0; } break; case TokenType.Quote: // Toggle quote state inQuote = !inQuote; break; case TokenType.Value: result.Append(token.Value); break; default: throw new InvalidOperationException("Unknown token type: " + token.Type); } } if (result.Length &gt; 0) { yield return result.ToString(); } } IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); } } </code></pre>
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    1. POC#, regular expressions : how to parse comma-separated values, where some values might be quoted strings themselves containing commas
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    1. COThere's a bug in this implementation. In IEnumerator<Token> GetEnumerator() method, you need to add "if (value.Length > 0) { yield return new Token(TokenType.Value, value.ToString()); }" within the while loop, at the end. Otherwise you are missing the final token
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