Re: extension to string.gmatch (structural regular expressions)
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- Subject: Re: extension to string.gmatch (structural regular expressions)
- From: Norman Ramsey <nr@...>
- Date: 2008年1月03日 16:40:08 -0500
> Here's a first attempt at a splitting gmatch: [quoted below]
Not bad but I think you return the extra position matched by the
final (). Mostly harmless.
You can also ditch the coroutines and simply do
return function() return aux(gm()) end
Norman
> function string.gmatchsplit(text, pattern)
> local gm = text:gmatch("()" .. pattern .. "()")
> local start = 1
> local function aux(...)
> if start == nil then
> return nil
> end
> local caps = select('#', ...)
> if caps == 0 then
> local finalpart = text:sub(start)
> start = nil
> return finalpart
> end
> local stop = (...) - 1
> local before = text:sub(start,stop)
> start = select(caps, ...)
> return before, select(2, ...)
> end
> return coroutine.wrap(
> function()
> while true do
> coroutine.yield( aux(gm()) )
> end
> end
> )
> end
>
> for part in string.gmatchsplit("one<delim>two<delim>three", "<delim>") do
> print(part)
> end