use strict;
use warnings;
my $str = "Title: Learning Perl  Author: Schwartz, Randal L. ISBN: xxxx";
if ($str =~ /^Title: (.*)\s+Author: (.*)\s+ISBN: (.*)/) {
  my ($title, $author, $isbn) = ($1, $2, $3);
  $author =~ s/\.//g; # Remove full stops (periods)
  print "<$title><$author><$isbn>";
}