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<?php $input = "56s/62b/56b - 42b/45b/26s"; preg_match("/(?<=#).*?(?=#)/", "1232#hello world#", $match); print_r($match) ?>
Output for 4.4.0 - 4.4.9, 5.0.5 - 7.1.0
Array ( [0] => hello world )
Output for 4.3.0 - 4.3.11, 5.0.0 - 5.0.4
Array ( )