1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)re_comp.3 8.1 (Berkeley) 6/4/93 33.\" 34.Dd June 4, 1993 35.Dt RE_COMP 3 36.Os 37.Sh NAME 38.Nm re_comp , 39.Nm re_exec 40.Nd regular expression handler 41.Sh SYNOPSIS 42.Fd #include <unistd.h> 43.Ft char * 44.Fn re_comp "const char *s" 45.Ft int 46.Fn re_exec "const char *s" 47.Sh DESCRIPTION 48This interface is made obsolete by 49.Xr regex 3 . 50It is available from the compatibility library, libcompat. 51.Pp 52The 53.Fn re_comp 54function 55compiles a string into an internal form suitable for pattern matching. 56The 57.Fn re_exec 58function 59checks the argument string against the last string passed to 60.Fn re_comp . 61.Pp 62The 63.Fn re_comp 64function 65returns 0 if the string 66.Fa s 67was compiled successfully; otherwise a string containing an 68error message is returned. If 69.Fn re_comp 70is passed 0 or a null string, it returns without changing the currently 71compiled regular expression. 72.Pp 73The 74.Fn re_exec 75function 76returns 1 if the string 77.Fa s 78matches the last compiled regular expression, 0 if the string 79.Fa s 80failed to match the last compiled regular expression, and \-1 if the compiled 81regular expression was invalid (indicating an internal error). 82.Pp 83The strings passed to both 84.Fn re_comp 85and 86.Fn re_exec 87may have trailing or embedded newline characters; 88they are terminated by 89.Dv NUL Ns s. 90The regular expressions recognized are described in the manual entry for 91.Xr ed 1 , 92given the above difference. 93.Sh DIAGNOSTICS 94The 95.Fn re_exec 96function 97returns \-1 for an internal error. 98.Pp 99The 100.Fn re_comp 101function 102returns one of the following strings if an error occurs: 103.Bd -unfilled -offset indent 104No previous regular expression, 105Regular expression too long, 106unmatched \e(, 107missing ], 108too many \e(\e) pairs, 109unmatched \e). 110.Ed 111.Sh SEE ALSO 112.Xr ed 1 , 113.Xr egrep 1 , 114.Xr ex 1 , 115.Xr fgrep 1 , 116.Xr grep 1 , 117.Xr regex 3 118.Sh HISTORY 119The 120.Fn re_comp 121and 122.Fn re_exec 123functions appeared in 124.Bx 4.0 . 125