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 CHAPTER 12 PROBLEMS
   
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QUESTION ON SCRIPT EXAMPLE 5—PERL: READING FILES AND LOOKING FOR TEXT PATTERNS (p. 595)
  1. To recognize both upper- and lowercase sequences, the pattern match included letters in upper- and lowercase: /([^ACGTacgt])/. Change the pattern specification to /([^ACGT])/i to get a case-insensitive match and test the script on a file containing mixed cases. Which version do you think is preferable in terms of the script's output and why?




 

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