Get character of folder name preceding a character., get character of folder name preceding a character.

Question

set theFolderName to "Macintosh HD:Users:user:Desktop:Landscapes_WK30_PSD"
set theCharacters to characters of theFolderName
using the above how can I extract the digits that preceed the _WK I know I can get the first x number of characters but that number varies so it needs to be everything before _WK

Answer 1

Indeed easier than i thought, assuming i haven't got the long way about it,
set folderPath to "Macintosh HD:Users:user:Desktop:Landscapes_WK30_PSD"
set {oldTID, my text item delimiters} to {my text item delimiters, ":"}
set folderName to last text item of folderPath
set my text item delimiters to "_WK"
set FolderEndName to last text item of folderName
set my text item delimiters to "_PSD"
set weekNumber to first text item of FolderEndName
set my text item delimiters to oldTID
display dialog weekNumber