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  1. or download this
    /"((?:[^"]+(?=")|"")*)"(?!")/
#          ^^^^^
  2. or download this
    /"((?:(?>[^"]+)|"")*)"(?!")/
#     ^^^     ^
  3. or download this
    if(  /"((?:[^"]+|"")*)("?)(?!")/  ) {
#                     ^ ^^
    die "Unclosed quote ($1)..." if ! $2;