in reply to positions of all regexp matches

You would have to maintain your own list as you go:

my $check = 'abcdefghijk';
my (@matches_start, @matches_end);
for (0 .. 9) {
    $check =~ /efg/;
    push @matches_start, $-[0];
    push @matches_end,   $+[0];
}

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----
I wanted to explore how Perl's closures can be manipulated, and ended up creating an object system by accident.
-- Schemer

Note: All code is untested, unless otherwise stated

In Section Seekers of Perl Wisdom