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<?php
$ptn = "/[IE][NS][FT][JP]/";
$str = "ISTJ, ESTP,ENTP but not EJPT";
preg_match_all($ptn, $str, $matches);
print_r($matches);
?>

Success #stdin #stdout 0.01s 20520KB

stdin

Standard input is empty

stdout

Array
(
    [0] => Array
        (
            [0] => ISTJ
            [1] => ESTP
            [2] => ENTP
        )

)

https://ideone.com/XgbFWY

language:

PHP (php 7.3.5)

created:

visibility:

public

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