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<?php echo preg_replace('/([a-zA-Z])([a-zA-Z])/i', '$1_$2_$3', 'algo = asslgo AND caca=8');
Output for git.master, git.master_jit, rfc.property-hooks
a_l_g_o_ = a_s_s_l_g_o_ A_N_D c_a_c_a_=8

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