comparison - Need to test string for instance of words from list in F# -

i have list of words in f# , string input. want see if of words in list contained in string. if using c# id run foreach loop on each word in string.split , run list.contains comparison. have come following code far, can't seem access list.contains on value 'str'

 let checkforvalue(x:string) =    str in x.split(' ')     match str commandlist -> console.writeline(str + " found: " + x)   () 

the current function returns true , executes console.writeline method.

any ideas doing wrong?

i think have misunderstood semantics of pattern matching syntax. match str commandlist not go through commandlist , see if str 'matches' of strings in commandlist.

instead, try destructure str pattern provide, in case says nothing actual structure, matched , bound name commandlist.

as @johnpalmer pointed out, shadow other commandlist binding. anyway, don't think pattern matching proper way solve problem, (especially?) if go far using active patterns.

here's how solve problem instead:

let checkforvalue (str : string) commandlist =     // convert set better performance     let commands = set.oflist commandlist     str.split(' ') |> seq.exists (fun x -> set.contains x commands)