Re: Modified allwords() function

[Mike Pall <mikelu-0505@...>]

Hi,

Geo Massar wrote:
> As per the book written by R. Ierusalimschy, allwords() function
> generates words which contain only letters and numbers. I'd like to modify
> the function so that words can be anything printable between spaces. The
> mod is shown below, rather more complicated. Is there a way to simplify
> the code?

This is a perfect example for a coroutine iterator (see chapter 9.3):

local function allmatches(pattern)
  return coroutine.wrap(function()
    for line in io.lines() do
      for word in string.gfind(line, pattern) do
        coroutine.yield(word)
      end
    end
  end)
end

for i in allmatches("%S+") do
  print(i)
end

Bye,
     Mike