ofcourse using regex alone you can get your desired output, but since you said you are studying regular expression with splitting, maybe the code below could help:
use warnings;
use strict;
my %hash;
while(<DATA>){
chomp;
my ($dns)=grep $_=>split/^.+?:/,$_;
my ($ip,$dns1)=split/,/,$dns;
$hash{$dns1}=$ip;
}
print $hash{$_},$/ foreach keys %hash;
__DATA__
host1 dns:192.168.243.30,asdf
host2 dns:192.168.243.1,qwert
You could check perldoc -f split for details Hope this helps
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