perl regex: negative lookahead between two characters -

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how include pattern between 2 characters in regular expression?

say wanted print in below text apart words in between " "

this "example".  "is" "an" example.  "this" example.

this i've tried far, think i'm missing something:

m/(?!"(.*)").*/g 

$s = 'this "is" "an" example'; @words = ($s =~ /"([^"]*)"/g);

@words contains words between " "


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