not really sure why the last match doesn't get included or why the first one is undef
I think the capture group needs to be closed before being able to push its value. This would work without further ado:
$data =~ /^(?:(\d+)\s*(?{ push @results, $^N }))+$/;
(Update) P.S.: if you use this construct in a loop like in the OP's case, you need to declare the lexical @results outside of the loop for it to work properly. I.e., while this is ok:
my @results;
while (<DATA>) {
@results = ();
/^(?:(\d+)\s*(?{ push @results, $^N }))+$/;
print "line $.: ", join('-', @results), "\n";
}
__DATA__
1 2 3 4 5
2 3 4 5 6
3 4 5 6 7
output:
line 1: 1-2-3-4-5
line 2: 2-3-4-5-6
line 3: 3-4-5-6-7
the following would work only once:
while (<DATA>) {
my @results;
/^(?:(\d+)\s*(?{ push @results, $^N }))+$/;
print "line $.: ", join('-', @results), "\n";
}
output:
line 1: 1-2-3-4-5
line 2:
line 3:
(Fixed /^(:?... typo — thanks eric256! )
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