Re: the most optimal string "trim" implementation

[Shmuel Zeigerman <shmuz@...>]

David Manura wrote:
> Here's the latest proposed
> version:
>
>    local match = string.match
>    function trim(s)
>      return match(s,'^()%s*$') and '' or match(s,'^%s*(.*%S)')
>    end

Here's my latest favorite. In a few tests I did, it slightly 
outperformed your variant, except for the all-space strings, where it 
performed worse (which I don't understand why).

function trim(s)
  local from = s:find("%S")
  return from and s:match(".*%S", from) or ""
end



--
Shmuel