split / / isn't magical. You're thinking of split ' '. 

>perl -le"@a = split / /, 'abc  def'; print 0+@a"
3

>perl -le"@a = split ' ', 'abc  def'; print 0+@a"
2

[download]

split ' ' is slightly better than split /\s+/, but like I said, I wouldn't use it anyway.

In reply to Re^3: LCS efficiency problem by ikegami
in thread LCS efficiency problem by zhe

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