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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


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"; }


line 1: 1-2-3-4-5 line 2: line 3:

(Fixed /^(:?... typo — thanks eric256! )

In reply to Re^2: Variable matching on a regex by almut
in thread Variable matching on a regex by LaintalAy

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