How to get the folder from a full file path?

I know %:p %:t thes things. But What I need now is not current folder I get a full file path from a regex match. 

And now I need to get the folder from this full path. 

I already Google a lot but can't find useful things all related about "%:t :p" things so how to make it. 

This is the code I use in the vimrc file. 

function! HandleURL()
  let s:uri = matchstr(getline("."), '[a-zA-Z]*:\/[^ >,;]*')
  echo s:uri
  if s:uri != ""
    if s:uri =~ '^http'
        silent exec "AsyncRun chrome ".s:uri.""
    else
        """"""""""""""
        "I want to use the totalcmd64 to run the folder of the s:uri here.
        """"""""""""""
        silent exec "AsyncRun TOTALCMD64 ".s:uri.""
    endif
  else
    echo "No URI found in line."
  endif
endfunction

Tnx in advance

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