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  1. or download this
    s/
       .
    ...
       (?<!JAZ(?=Z))
       (?<!JAZZ)
    /a/xgs;
    
  2. or download this
    s/~/a/g;
    s/JAZZ/~/g;
    s/[^~]/a/g;
    s/~/JAZZ/g;
    
  3. or download this
    s/(JAZZ|.)/$1 eq 'JAZZ' ? $1 : 'a'/egs;
    
  4. or download this
    s/(JAZZ)|./defined($1) ? $1 : 'a'/egs;
    
  5. or download this
    s/((?:JAZZ)*)./$1a/gs;