Ah, but a more complete version is easy to write too! :) (Although, I admit, a bit more longwinded...)
use re 'eval';
my $string = qr[
" [^"\\]* (?:\\.|[^"\\])* "
| ' [^'\\]* (?:\\.|[^'\\])* '
]x;
my $alist = qr[(?: [^"'>]* | $string )*]x;
my $ehead = qr[ <\w+ $alist /? > ]x;
my $textarea = qr[
<textarea $alist>
(?:
[^<]*
| < (?!/textarea>)
)*
</textarea>
]x;
my $asp = qr[
<%
(?:
(?> [^%"']* )
| $string
| % (?! > )
)+
%>
]x;
my $html = qr[
(?:
(?> [^<"'] )
| $textarea
| $ehead
| </\w+>
)+
]x;
my @parsed;
() = $string =~ /
($asp) (?{ push @parsed, [asp => $1] })
| ($html) (?{ push @parsed, [html => $2] })
/gx;
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