#!/usr/bin/perl use strict; use warnings; use HTML::Parser (); use HTML::Entities qw(encode_entities); sub disable_tags_but { my ($text, $allowed_tags) = @_; my @text; my %allowed_tag = map { $_ => 1 } @{$allowed_tags || []}; my $tag_h = sub { my ($tag, $text) = @_; $text = encode_entities($text, "<") unless $allowed_tag{$tag}; push(@text, $text); }; HTML::Parser->new( start_h => [$tag_h, 'tagname, text'], end_h => [$tag_h, 'tagname, text'], default_h => [\@text, '@{text}'], )->parse($text)->eof; return join("", @text); } # # Test it # print disable_tags_but(< ... EOT