Overly idiomatic but this was for fun, not production :P–
use XML::LibXML;
my $doc = XML::LibXML->load_html( location => "example.html",
{ recover => 1 } );
my @ids2text = map { [ $_->value, $_->getOwnerElement->textContent ] }
$doc->findnodes('//@id');
$_->[1] =~ s/\W+//g for @ids2text;
print join ", ", map sprintf("%s=%s", @$_), @ids2text;
While this happens to be XHTML
Sidenote on that. I am sure you know the sample is not XHTML but I thought I'd call it out for the sake of readers.
Update: I missed the "transitional" part of the XHTML declaration. It is indeed, shockingly, valid transitional XHTML. Goes to show how on point haukex is on this matter.
Update 2: updated node title per LanX. Pulled strict/warnings to shorten post. Plus link to module: XML::LibXML
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