Re: precompiled regex's to lua

[Shmuel Zeigerman <shmuz@...>]

Roberto Ierusalimschy wrote:
> When sending results, it is quite useful to know results of what. Could
> you send the source of these tests?

For what it worth :)

-- A simple test with synthesized CSV:

local pcre = require "rex_pcre"
local rep, gmatch = string.rep, (string.gmatch or string.gfind)

local subj = rep (rep ("abcd", 100) .. ",", 100) .. "a"

local num = assert (tonumber (arg[1]))

--> 700 uSec/iteration (Lrexlib PCRE binding)
if arg[2] == "pcre" then
  local r = pcre.new ("[^,]+\\,?") -- precompiling regex
  for i = 1, num do
    r:gmatch (subj, function(m, t) end)
  end
end

--> 1500 uSec/iteration (Lua 5.0)
--> 2200 uSec/iteration (Lua 5.1)
if arg[2] == "lua" then
  for i = 1, num do
    for c in gmatch (subj, "[^,]+%,?") do end
  end
end


--
Shmuel