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<?php var_dump(preg_split('/\w{2}\.\w{2}_\w{2}$/', 'i_am_the_route.fr.fr_FR'));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(2) { [0]=> string(15) "i_am_the_route." [1]=> string(0) "" }