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<?php
 
$text = '__This_is__ a __test__';
preg_match_all('/__(?:(?!__).)+__/', $text, $matches);
print_r($matches);

Success #stdin #stdout 0.04s 25728KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => Array
        (
            [0] => __This_is__
            [1] => __test__
        )

)

https://ideone.com/smVigc

language:

PHP (php 7.3.5)

created:

visibility:

secret

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