use strict;
my $str = '1 Question
2 Answer 1
3 Answer 2
4 Answer 3
5 Answer 4
6 Answer 5
7 Question
8 Answer 1
9 Answer 2
10 Answer 3
11 Answer 4
12 Answer 5';
my $regex = qr/(.*)\n(.*)\n(.*)\n(.*)\n(.*)\n(.*)\s*/p;
my $subst = '<h1>$1</h1><p>$2</p><br><p>$3</p><br><p>$4</p><br><p>$5</p>';
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