#use strict;
#use warnings;

my ($dirname, $file, %words);

opendir(DIR, ".") or die "can't opendir $dirname: $!";

while (defined($file = readdir(DIR))) {
	if ($file =~ /\.html?/) {
		open my $F, $file or die "Could not open $file\n";
		while (<$F>) {
		#do stuff
		s/
		    (?<=                  # Look back-group
		     weak                # Match the word weak
		     <INPUT TYPE=radio NAME=     # tag
		     (                   # Capuring group: $1 / \1
		       \w{2}\d\w{2}      # 
		     )                   # End-capture
		     VALUE=\d>           # tag
		 
		     (?:                 # Non capturing group
		       <INPUT TYPE=radio NAME=     # tag
		       \1                # It's possible that this should be $1, as I said, the code is untested.
		       VALUE=\d>
		     ){6}                # There are 7 input tags, one already matches, so 6 to go.
		     )                   # End look-back
		     (?=                 # Look-ahead-group
		       strong
		     )                   # End look-ahead
		   /
		     the text you want to insert
		   /ixg;
		}
		close $F;
		}
}
closedir(DIR);