in reply to non-greedy piecewise matching
You have to use '.+?' instead of '.+' to make non-greediness. Take a look at perlre.
As you said, if .xml is present after each records, then we can also use substitution or split function.
$file =~ s/(\.xml)/$1\n/g;
Electric eels were invented at the same time as electricity
Before electricity was invented, electric eels had to stun with gas
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