> $^N
indeed
use v5.12;
use warnings;
my $str ='43:1:1; 43:1:2; 43:1:3; 43:1:4; 43:1:5; 43:1:6; 27:3:7; 27:3
+:8; 27:3:9; 65:1:4; 65:1:18';
say $str;
$str =~ s#(\d+:\d+:)(\d);(?: \1((??{$^N+1}));)+#$1$2-$3#g;
say $str;
C:/Strawberry/perl/bin\perl.exe -w d:/tmp/pm/sequencer.pl
43:1:1; 43:1:2; 43:1:3; 43:1:4; 43:1:5; 43:1:6; 27:3:7; 27:3:8; 27:3:9
+; 65:1:4; 65:1:18
43:1:1-6 27:3:7-9 65:1:4; 65:1:18
Compilation finished at Wed May 26 15:46:31
PS: beautifying with /x modifier and adding missing ; in replacement left for the interested reader. :)
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