REGEX(3) 1988 REGEX(3) NNAAMMEE re_comp, re_exec - regular expression handler SSYYNNOOPPSSIISS cchhaarr **rree__ccoommpp((ss)) cchhaarr **ss;; rree__eexxeecc((ss)) cchhaarr **ss;; DDEESSCCRRIIPPTTIIOONN _R_e__c_o_m_p compiles a string into an internal form suitable for pattern matching. _R_e__e_x_e_c checks the argument string against the last string passed to _r_e__c_o_m_p. _R_e__c_o_m_p returns 0 if the string _s was compiled successfully; otherwise a string containing an error message is returned. If _r_e__c_o_m_p is passed 0 or a null string, it returns without changing the currently compiled regular expression. _R_e__e_x_e_c returns 1 if the string _s matches the last compiled regular expression, 0 if the string _s failed to match the last compiled regular expression, and -1 if the compiled regular expression was invalid (indicating an internal error). The strings passed to both _r_e__c_o_m_p and _r_e__e_x_e_c may have trailing or embedded newline characters; they are terminated by nulls. The regular expressions recognized are described in the manual entry for _e_d(1), given the above difference. SSEEEE AALLSSOO ed(1), ex(1), egrep(1), fgrep(1), grep(1), regexp(3) DDIIAAGGNNOOSSTTIICCSS _R_e__e_x_e_c returns -1 for an internal error. _R_e__c_o_m_p returns one of the following strings if an error occurs: _N_o _p_r_e_v_i_o_u_s _r_e_g_u_l_a_r _e_x_p_r_e_s_s_i_o_n, _R_e_g_u_l_a_r _e_x_p_r_e_s_s_i_o_n _t_o_o _l_o_n_g, _u_n_m_a_t_c_h_e_d _\(, _m_i_s_s_i_n_g ], _t_o_o _m_a_n_y _\(_\) _p_a_i_r_s, _u_n_m_a_t_c_h_e_d _\). Printed 7/27/90 May 1