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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: (?<!
Electric eels were invented at the same time as electricity
Before electricity was invented, electric eels had to stun with gas
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