Make sure you use the <code> tages, then your code will look like this:

#!/usr/bin/perl5


require "get_form_data.pl";
&get_form_data();

$search_term = $FORM{'search'};

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

opendir(DIR, ".");
while($file = readdir(DIR))
{
    next if($file !~ /.html/);
    open(FILE, $file);
    $found_match = 0;
    $title = "";
    while()
    {
        if(/$search_term/i)
        {
            $found_match = 1;
        }
        if((//) || ($found_title))
        {
            if((/<\/TITLE>/) && (//))            {
                chop;
                $title = $_;
                $title =~ s///g;
                $title =~ s/<\/TITLE>//g;
            }
            else
            {
                if($found_title == 1)
                {
                    $title = $_;
                    $found_title = 2
                }
                elsif($found_title == 2)
                {
                    $found_title = 0;
                }
                else
                {
                    $found_title = 1;
                }
            }
        }
    }
    if($found_match)
    {
        print "<A HREF=\"$file\">$title</A>\n";
        print "<BR>\n";
    }
    
    close(FILE);
}

closedir(DIR);




exit;
[download]

An easy way to do what you want is to add another variable, and if a match is found put a 1 in it. At the end of your script if the variable == 0 then print your sorry message.