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<?php
$haystack = "abc[d]-ef";
preg_match_all('/[][-]/', $haystack, $matches);
print_r($matches);

Success #stdin #stdout 0s 52488KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => Array
        (
            [0] => [
            [1] => ]
            [2] => -
        )

)

https://ideone.com/ECgFSJ

language:

PHP (php 7.3.5)

created:

visibility:

public

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