$Hash_filenames{$plf}=@file_lines;

##</code><code>##

$Hash_filenames{ $plf } = \@file_lines;

##</code><code>##

$Hash_filematches{$filename}=  grep( /\/\Q$file_name\E#/i, $Hash_filenames{$plf} );

##</code><code>##

@{ $Hash_filematches{ $filename } } = grep /\Q/$file_name\E#/i, @{ $Hash_filenames{ $plf } };