string.Where() in Unity C#?

What I'm trying to do: http://stackoverflow.com/questions/...ir-equivalent-such-as-a-for-a/2393966#2393966

edit: HttpUtility isn't available because System.Web isn't recognized... any way to get around this? Making iOS app if that makes any difference.


original post:

Code (csharp):

1. string decomposed = input.Normalize(System.Text.NormalizationForm.FormD);
2. char[] filtered = decomposed.Where(c => char.GetUnicodeCategory(c) != System.Globalization.UnicodeCategory.NonSpacingMark).ToArray();
3. string newString = new String(filtered);

Unity doesn't like the .Where(). Is there a way to get that to work or is there a way I can just rewrite it?

edit: using System.Linq; got it to compile. thanks to Zerot on irc