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  1. or download this
    /^"( [^\\"]+ | \\+[^\\"] | (\\\\)*\\" )*"$/x
  2. or download this
    /^"( [^\"]+ | \+[^\"] | (\\)*\" )*"$/x
  3. or download this
     C:\> perl -le"print for @ARGV" hi "hi" "\"hi\"" "\\hi\\" "\\hi\\\""
hi
...
"hi"
\\hi\
\\hi\"
  4. or download this
     C:\> perl -le"print for @ARGV" "6""5'"
6"5'
...
my
little
friend