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

Regex probably doesn't count as "straight-forward", but this is what I've got:

Regex.IsMatch(listString, "(?<=,|^)" + testWord + "(?=,|$)")

Update: Per Eric's comment below, this should be:

Regex.IsMatch(listString, "(?<=,|^)" + Regex.Escape(testWord) + "(?=,|$)")