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<?php
$arr = array ( 'FOO', 'FOO"', '"FOO', '"FOO"', 'xFOO', 'FOOy');
print_r(preg_grep('/(?<!")FOO|FOO(?!")/', $arr));
?>

Success #stdin #stdout 0.01s 20520KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => FOO
    [1] => FOO"
    [2] => "FOO
    [4] => xFOO
    [5] => FOOy
)

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language:

PHP (php 7.3.5)

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public

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