$ro->insert(end => join "", map s/^(\d\d)\d*/$1%/r . "\n", @matches[...] );
$ro->insert(end => join "", map { do { (my $s = $_ ) =~ s/^(\d\d)\d*/$1%/ . "\n"; $s }, @matches[...] });
Try:
$ro->insert(end => join "", map { (my $r = $_) =~ s/^(\d\d)\d*/$1%/; "$r\n"; } @matches[0 .. $bestcount - 1]);
Update:
... the s///r pragma.
NB: s///r is not a pragma. /r is a modifier
(update: available from Perl version 5.14 on)
of the s/// operator.
Give a man a fish: <%-{-{-{-<
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