Best way to check for string in comma-delimited list with .NET?

Question

I\'m reading a comma-delimited list of strings from a config file. I need to check whether another string is in that list. For example:

\"apple,banana,cheese\"

Answer 1

This works, but regexes are pretty slow if they get complicated. That said, the word boundary anchor makes this sort of thing pretty easy.

var foods = "apple,banana,cheese";

var match = Regex.Match(foods, @"\bapple\b");

if (match.Success)
    Console.WriteLine(match.Value);