use strict;
my $str = 'Inverted HFFSfor Primary Wrap Or Secondary Multi Wrap
HFFSwith PDSPbackgroud Feederlense & Product Alignerigit
HFFSwith Cooler JKLHbetween Feeder & Product Aligner';
my $regex = qr/\B([a-z](?=[A-Z])|[A-Z](?=[a-z]))/p;
my $subst = '$1 ';
my $result = $str =~ s/$regex/$subst/rg;
print "The result of the substitution is' $result\n";
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html