Although you're right about the quoting mechanisms, I wouldn't tell people to follow your examples. If there's a way not to use the string form of eval, take it. Creating an anonymous subroutine lets you write Perl code exactly how you should write it and without any worries about quoting. You don't have to worry about the difference in any of these.
my $hd = sub { '[]' =~ /\\[\\]/ };
In your last example, since you're already using an alternate delimiter, just choose one that doesn't show up in the data. That takes care of the syntax error quite nicely, and it's that reason we have alternate delimiters. Then you won't need three lines for a one line statement. :)
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