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;
A Programming Language, 1962
Programming the 1900 series in COBOL, 1974
Algorithms + Data Structures = Programs, 1976
The C Programming Language, 1978
System V - Interface definition, 1986
Z80 Assembly Language Programming, 1979
TheSOURCE User's Manual, 1979
The C Primer, 1983
Interactive Fortran 77, A Hands on Approach, 1984
Perl.1 man page, 1991
Results (337 votes),