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<?php preg_match( '/^\[(\d+)#(.*)\]$/', '[1#nation_regular_besoin_ponctuel]', $matches); var_dump($matches);
based on rDkH4
Output for 4.3.0 - 7.2.0
array(3) { [0]=> string(34) "[1#nation_regular_besoin_ponctuel]" [1]=> string(1) "1" [2]=> string(30) "nation_regular_besoin_ponctuel" }