array filtering

[Ray Andrews <rayandrews@xxxxxxxxxxx>]

    I'm getting better at various filterings
      but this one eludes me:
      
      arr=( /dira/${1}/dirb/ /dirc/A${1}B/dird/ /dire/${1}/
      /dirf/C${1}D/ )
      
      ... it's pretty fussy, but I want to filter out the first and
      second elements.  The test is that for a list of directories, for
      an element to be retained the argument ($1) may be an exact
      directory name, or a partial directory name, but it must be the
      last directory.  Not sure if I'm expressing that correctly. No
      subdirectories may follow the matched name, be it exact or
      partial.
      
      
      arr=( ${(M)arr:#(#i)*/$1/} )
    
      ... that works if the name matches exactly but:
      
      arr=( ${(M)arr:#(#i)*/*$1*/} )
      
      ... that ends up too broad, $1 matches anywhere irrespective of
      slashes.
      
    arr=( ${(M)arr:#(#i)*/*$1[^/]*/} )
      
      ... ends up too narrow, it catches a completed name but misses the
      exact match which puzzles me because I'd read that: '... anything
      except a slash, any number of characters or none' -- which should
      find the exact match: ' [^/]* ' should simply be empty, no?