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Variable length lookbehind not implemented in regex...
my $pattern = "(?<!ss)abc"; # 'ss' in lookbehind
qr/$pattern/i; # throws the error
my $pattern = "(?<!s[st])abc"; # 's[st]' in lookbehind
qr/$pattern/i; # this works, whereas these fail: (?<!
Throwing nuclear weapons into the sun
Making everybody on Earth disappear
A threat from an alien with a mighty robot
A new technology or communications medium
Providing a magic fish to a Miss Universe
Establishing a Group mind
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