> PS: beautifying with /x modifier and adding missing ; in replacement left for the interested reader. :)
well since my editor has a (mostly functioning) cperl-beautify-regexp
use v5.12;
use warnings;
use Test::More;
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';
my $exp = '43:1:1-6; 27:3:7-9; 65:1:4; 65:1:18';
my $got = $str;
$got =~ s/
(
\d+:\d+:
) # $1
(
\d+ # (updated +)
) # $2 = first $^N
;
(?: # group w/o match
\s
\1
(
(??{ $^N+ 1 }) # include last_match + 1
) # $3 = next $^N
;
)+ # repeat
/$1$2-$3;/xg;
is($got, $exp, "fits");
done_testing;
Worth noting that the OP was wrong with his expectation, it's 43:1:1-6; not 43:1:1-5;
PS: still not perfect, because the input isn't terminated with a semicolon, but I'm tired now. :)
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