Re: Lpeg query
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- Subject: Re: Lpeg query
- From: Sean Conner <sean@...>
- Date: 2014年1月19日 16:50:56 -0500
It was thus said that the Great David Heiko Kolf once stated:
> Gavin Wraith wrote:
>
> If you want it to return nil, make sure that your pattern does not match
> in this case. You would simply have to change your definition of WORDS
> to require at least one captured word:
>
> local WORDS = BLANK*(C(WORD)*BLANK)^1*END
>
> This should then work as expected.
You can also have LPeg return the constructed table for you. Using your
original definition of WORDS:
local WORDS = BLANK*(C(WORD)*BLANK)^0*END
Try the following:
local Ct = lpeg.Ct
local TWORD = Ct(WORDS)
x = TWORD:match" one two three "
y = TWORD:match" "
z = TWORD:match""
Ct() will collect the captures of the given pattern into a table, which it
returns. Since BLANK does no capture, its patterns aren't stored.
-spc