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  1. or download this
      DB<171> $str=$str0
 => " bla0 \"ignore a1\" bla1 \"ignore a2\" bla2"
...

  DB<174> $str=join '"',@parts
 => " blA0 \"ignore a1\" blA1 \"ignore a2\" blA2"
  2. or download this
      DB<185> $x=0;$str=$str0
 => " bla0 \"ignore a1\" bla1 \"ignore a2\" bla2"

  DB<186> $str= join '"', map {s/a/A/ unless $x++%2;$_} split '"', $st
+r
 => " blA0 \"ignore a1\" blA1 \"ignore a2\" blA2"