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<?php echo strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2_$8', 'eOaUi')); die; echo preg_replace_callback('/([a-z])([A-Z])/', function (array $matches) { var_dump($matches); }, 'eOaUi');
Output for git.master, git.master_jit, rfc.property-hooks
e_o_a_u_i

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