I'm not sure exactly how you want to implement your search, but perhaps this will help provide a hint as to at least one possibility. I'm sure someone will point out a better way to do it, but I found that this works:

use strict;

my ($htm_file);

opendir(CUR_DIR, ".") || die "Can't open current directory: $!\n";
foreach $htm_file (grep -f && -e && /\.htm$/i, readdir(CUR_DIR)) {

  open(HTM_FILE, "$htm_file") or die "Can't open $htm_file: $!\n";
  while (<HTM_FILE>){ # while there are lines in the file
     if(/<meta/i){    # if the line is a meta tag, have a look at it
        /content=\"(.+?)\">/i;  # if it contains 'content' grab it
        print "$1\n";  #  here's where you do something with it
     }
  }
  close HTM_FILE or die  "Can't close $htm_file: $!\n";
}
closedir  CUR_DIR;
[download]

Hope this helps. Liam