[REBOL] Re: questions about VID and parse.
From: joel:neely:fedex at: 11-Mar-2002 7:53
Hi, Christophe,
Coussement Christophe wrote:
> > Also another question about parse. How to use a string as a pattern?
> > parse "hello world" ??
> > I want ["hello" "rld"]
> > By what should I replace ?? to make this sequence ("wo" in this example)
> > considered as a whole.
> [Coussement Christophe] try:
> >> parse "hello world" none
> == ["hello" "world"]
> >>
>
I interpreted the question as wanting "wo" to be the marker/delimiter
between fragments of the string, instead of whitespace. That could be
done something like this:
marker: "wo"
fragment: ""
collection: []
parse-rule: [
any [
copy fragment to marker (append collection fragment)
marker
]
copy fragment to end (append collection fragment)
]
which gives:
>> parse "hello world" parse-rule
== true
>> collection
== ["hello " "rld"]
only leaving open the issue of the trailing whitespace in "hello ",
but that wasn't stated in the delimiter...
-jn-
--
; sub REBOL {}; sub head ($) {@_[0]}
REBOL []
# despam: func [e] [replace replace/all e ":" "." "#" "@"]
; sub despam {my ($e) = @_; $e =~ tr/:#/.@/; return "\n$e"}
print head reverse despam "moc:xedef#yleen:leoj" ;
