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    r/bin/perl
    use v5.12;
    ...
             } else {
                  print "No match: |$_|\n";
             }
    
  2. or download this
    Nested quantifiers in regex; marked by <-- HERE in m/((?<word1>\b\w*a\
    +b))(?<word2>\s+++ <-- HERE ++))/ at ./Chapter8_Exer5 line 12