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MRI 1.8.7-p371
>> $KCODE
=> "NONE"
>> "s.net" =~ /\A[^\W_]+([-.][^\W_]+)*\.[a-z]{2,6}\.?\Z/i
=> 0
>> $KCODE = 'UTF8'
=> "UTF8"
>> "s.net" =~ /\A[^\W_]+([-.][^\W_]+)*\.[a-z]{2,6}\.?\Z/i
=> 0
MRI 1.9.3-p327, Rubinius f76d3f67, JRuby 1.7.1 (1.9.3)
>> "s.net" =~ /\A[^\W_]+([-.][^\W_]+)*\.[a-z]{2,6}\.?\Z/i
=> nil
>> "t.net" =~ /\A[^\W_]+([-.][^\W_]+)*\.[a-z]{2,6}\.?\Z/i
=> 0
>> "s.net" =~ /\A[^\W_]+([-.][^\W_]+)*\.[a-z]{2,6}\.?\Z/
=> 0
Rubinius f76d3f67, JRuby 1.7.1 (1.8.7)
>> $KCODE
=> "NONE"
>> "s.net" =~ /\A[^\W_]+([-.][^\W_]+)*\.[a-z]{2,6}\.?\Z/i
=> 0
>> $KCODE = 'UTF8'
=> "UTF8"
>> "s.net" =~ /\A[^\W_]+([-.][^\W_]+)*\.[a-z]{2,6}\.?\Z/i
=> nil
>> "t.net" =~ /\A[^\W_]+([-.][^\W_]+)*\.[a-z]{2,6}\.?\Z/i
=> 0
>> "s.net" =~ /\A[^\W_]+([-.][^\W_]+)*\.[a-z]{2,6}\.?\Z/
=> 0
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