I tried to fix all the things you suggested but i still get errors that dont make sence to me like: 
C:\Perl>perl -cw create2.pl
[Wed Aug 22 11:10:17 2001] (eval 1): Array found where operator expect
+ed at (eva
l 1) line 1, at end of line
[Wed Aug 22 11:10:17 2001] (eval 1):    (Do you need to predeclare Car
+p::longmes
s?)
[Wed Aug 22 11:10:17 2001] (eval 1): Array found where operator expect
+ed at (eva
l 1) line 2, at end of line
[Wed Aug 22 11:10:17 2001] (eval 1):    (Do you need to predeclare Car
+p::shortme
ss?)
[Wed Aug 22 11:10:17 2001] (eval 1): Array found where operator expect
+ed at (eva
l 1) line 3, at end of line
[Wed Aug 22 11:10:17 2001] (eval 1):    (Do you need to predeclare Car
+p::shortme
ss?)
[Wed Aug 22 11:10:17 2001] (eval 1): Array found where operator expect
+ed at (eva
l 1) line 4, at end of line
[Wed Aug 22 11:10:17 2001] (eval 1):    (Do you need to predeclare Car
+p::longmes
s?)
Undefined subroutine &Carp::longmess called at C:\PERL\lib/Carp.pm lin
+e 296.

[download]
Lines one to four look fine to me? here is the revised code. 
#!/usr/bin/perl -w
#use CGI::Carp('fatalsToBrowser');
use Carp;
use diagnostics;
use strict;
use warnings;

my @pages=();
my @xfilenames=(); my @filenames=();
my @xtitles=(); my @titles=();
my @xheadings=(); my @headings=();
my @xstuff=(); my $xstuff=""; my @stuff=();
my @xtemplate=(); my $xtemplate=""; my @template=();

open(PAGES, "<pages.txt") || die $!;
@pages = PAGES;
close(PAGES);

foreach $_ (@pages) {
    if (m/^\*{4}filename.ext\*{4}/) {
        push(@xfilenames, $_)
        }
    elsif (m/^\*{4}title\*{4}/) {
        push(@xtitles, $_)
        }
    elsif (m/^\*{4}heading\*{4}/) {
        push(@xheadings, $_)
        }
    else {    
        push(@xstuff, $_)
        }
    }

foreach $_ (@xfilenames) {
    s/^\*{4}filename.ext\*{4}//;
    chomp ($_);
    push(@filenames, $_);
    }
foreach $_ (@xtitles) {
    s/^\*{4}title\*{4}//;
    chomp ($_);
    push(@titles, $_);
    }
foreach $_ (@xheadings) {
    s/^\*{4}heading\*{4}//;
    chomp ($_);
    push(@headings, $_);
    }

$xstuff = join("", @xstuff);
@stuff = $xstuff =~ /\*{4}stuff\*{4}(.*?)\*{4}endstuff\*{4}/sg;

open(TEMPLATE, "<template.html") || die $!;
@xtemplate = <TEMPLATE>;
close (TEMPLATE);

$xtemplate = join("", @xtemplate);
@template = $xtemplate =~ /^(.*?)\*{4}filename.ext\*{4}/sg;
push (@template, $xtemplate =~ /\*{4}filename.ext\*{4}(.*?)\*{4}title\
+*{4}/sg);
push (@template, $xtemplate =~ /\*{4}title\*{4}(.*?)\*{4}headings\*{4}
+/sg);
push (@template, $xtemplate =~ /\*{4}headings\*{4}(.*?)/sg);

for ($i=0; $i < (@filenames); $i++) {
    open(FILE, ">@filenames[$i]") || die $!;
    print FILE qq($temlate[0] $title[$i] $template[1] $heading[$i] $te
+mplate[2] $stuff[$i] $template[3]);
    close(FILE);
    }

print "Content-type:text/html\n\n";
print <<EndHTML;

<!DOCTYPE HTML PUBLIC
"-//W3C//DTD HTML 4.0 Transisional//EN"
"http://www.w3.org/TR/REC-html40/loose.dtd">
<html>

<head>

<title>create</title>
</head>
<body>
EndHTML

foreach (@filenames) {
    print "$a <p>Name:$_</p>";
    }
print "<hr />";
foreach (@titles) {
    print "<p>Titles:$_</p>";
    }
print "<hr />";
foreach (@headings) {
    print "<p>Headings:$_</p>";
    }
print "<hr />";
foreach (@stuff) {
    print "<p>stuff:$_</p>";
    }
print <<EndHTML;
</body>
</html>
EndHTML

[download]

In reply to errors revisited by maddfisherman

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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