http://blogs.msdn.com/kathleen/archive/2009/07/09/video-active-patterns-f.aspxAs a continuation of featuring patterns in F#, this is part 2 of an interview with programming writer, Gordon Hogenson. In this interview he describes Active Patterns , which can be used to customize and extend F#’s pattern matching capabilities. en-USCommunityServer 2.1 SP1 (Build: 61025.2)