That snippet shows that yours is broken too. It doesn't return the last segment ("EN").
my $string = "RYOURPOSTBROKEN";
print("input: $string\n");
print("expecting: R YOURPOSTBR OK EN\n");
print("\n");
{ # mwah (split)
my $re = qr/(?<=[KR])(?!P)/;
my @arr = split $re, $string;
print("split $re: @arr\n");
}
{ # tachyon-II (re)
my $re = qr/(.*?[KR])(?!P)/s;
my @arr = $string =~ /$re/g;
print("$re: @arr\n");
}
{ # mwah (re)
my $re = qr/[^KR]+.(?!P)/s;
my @arr = $string =~ /$re/g;
print("$re: @arr\n");
}
input: RYOURPOSTBROKEN
expecting: R YOURPOSTBR OK EN
split (?-xism:(?<=[KR])(?!P)): R YOURPOSTBR OK EN
(?s-xim:(.*?[KR])(?!P)): R YOURPOSTBR OK
(?s-xim:[^KR]+.(?!P)): YOU POSTBR OK EN
(?s-xim:[^KR]*.(?!P)): R YOU POSTBR OK EN
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