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run code in 150+ php & hhvm versions
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<?php echo preg_replace('/([a-zA-Z])([a-zA-Z])/i', '$1_$2', 'algo = asslgo AND caca=8');
Output for 4.3.0 - 7.1.0
a_lg_o = a_ss_lg_o A_ND c_ac_a=8