zutils package:base R Documentation _M_i_s_c_e_l_l_a_n_e_o_u_s _I_n_t_e_r_n_a_l/_P_r_o_g_r_a_m_m_i_n_g _U_t_i_l_i_t_i_e_s _D_e_s_c_r_i_p_t_i_o_n: Miscellaneous internal/programming utilities. _U_s_a_g_e: .standard_regexps() _D_e_t_a_i_l_s: '.standard_regexps' returns a list of 'standard' regexps, including elements named 'valid_package_name' and 'valid_package_version' with the obvious meanings. The regexps are not anchored.