rebol / red parse with [to end] rule

Question

I'm trying to understand parse from the ground up so don't tell me to use split in this case.

sentence: "This is a sentence"

parse sentence [
    any [
        [any space] copy text [to space | to end] skip
        (print text)
    ]
 ]

Why do I not get the last word in the sentence, and only:

This
is
a

Did the [to end] not work?

score 4 · Accepted Answer · answered Jan 21 '19 at 11:48

4

to end did work, but then you have skip there and you're already at the end, so skip fails. See this:

>> parse sentence [any [[any space] copy text [to space | to end ] (print text) skip]]
This
is
a
sentence

answered Jan 21 '19 at 11:48

rebolek

1,281
7
16

sqlab · Answer 2 · 2019-01-24T12:32:18.110

1

An alternative solution without to and end

sentence: "This is a sentence"
space:  charset " "
chars: complement space

parse sentence [
    any [
       any space 
       copy text some chars
       (print text) 
    ]
]

In Rebol2 you have to use parse/all, if you deal with strings, but the most simple solution in Rebol2 for splitting is

>> parse sentence none
== ["This" "is" "a" "sentence"]

edited Jan 24 '19 at 12:32

answered Jan 24 '19 at 10:44

sqlab

6,412
1
14
29

rebol / red parse with [to end] rule

2 Answers2