sequence//5

Availability::- use_module(library(dcg/high_order)).

[semidet]sequence(:Start, :Element, :Sep, :End, ?List)//

Match or generate a sequence of Element enclosed by Start end End, where each pair of elements is separated by Sep. More formally, it matches the following sequence:

Start, (Element, (Sep,Element)*)?, End

The example below matches a Prolog list of integers:

?- phrase(sequence(("[",blanks),
                   number, (",",blanks),
                   (blanks,"]"), L),
                   `[1, 2, 3 ] a`, Tail).
L = [1, 2, 3],
Tail = [32, 97].