The  m[(^\0+)] match results in an undefined value for  $mask when there is no common base substring at all, which then hiccups a "Use of uninitialized..." warning in the substr expression (if warnings are enabled). Happily, this is easily fixed by using  m[(^\0*)] instead!

Give a man a fish:  <%-{-{-{-<

In reply to Re^2: An efficient way to gather a common portion of several strings' beginnings by AnomalousMonk
in thread An efficient way to gather a common portion of several strings' beginnings by igoryonya

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