[REBOL] Re: Parse limitation ?
From: lmecir:mbox:vol:cz at: 8-Oct-2003 14:23
Hi Pat,
----- Original Message -----
From: "patrick à la poste"
> Hi List,
>
> I'd like to parse a string searching for two things at the same time.
> it seems to me that this is impossible.
>
> For example, a text from which I want to extract the HREF and the SRC target.
>
> myText: {<A HREF="#section1"><IMG SRC="foobar.gif"><A HREF="#section1">}
>
> parse myText [
> any [ thru "HREF=" copy target to ">" (print target) |
> thru "SRC=" copy target to ">" (print target)
> ] ; any
> ] ; parse
>
> "#section1"
> "#section1"
>
> parse myText [
> any [ thru "SRC=" copy target to ">" (print target) |
> thru "HREF=" copy target to ">" (print target)
> ] ; any
> ] ; parse
>
> "foobar.gif"
> "#section1"
>
> The result is different depending which rule comes first. The only way I see as a workaround
is to parse the text twice. Is there a better (smarter) way?
>
> Regards
> Patrick
This is possible with PARSE. You can use my parse enhancements e.g. Have a look at: http://www.fm.vslib.cz/~ladislav/rebol/parseen.r
Ladislav
