Reconocer etiquetas HTML

[aloqui]

Para perl puedes utilizar la libreria HTML::TreeBuilder
Necesitarás hacer algo así:

use HTML::TreeBuilder;
my $tree = HTML::TreeBuilder->new_from_file ( $file );
my @nodosB = ( $tree->look_down( "_tag", "b" ) );
my @nodosS = ( $tree->look_down( "_tag", "strong" ) );