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  1. or download this
      DB<7> p 'okoK'=~ /(o|k)(?{print "#1 matched"})(k|i)(O|K)(K)/
#1 matched
  2. or download this
      DB<12> p 'okoK'=~ /(o|k)(?{print "#1 matched"})(k|i)X(O|K)(K)/     #
+ no "X", why bother?

  DB<13>