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.\" $FreeBSD$ 34.\" 35.Dd June 4, 1993 36.Dt RE_COMP 3 37.Os 38.Sh NAME 39.Nm re_comp , 40.Nm re_exec 41.Nd regular expression handler 42.Sh SYNOPSIS 43.Fd #include <unistd.h> 44.Ft char * 45.Fn re_comp "const char *s" 46.Ft int 47.Fn re_exec "const char *s" 48.Sh DESCRIPTION 49This interface is made obsolete by 50.Xr regex 3 . 51It is available from the compatibility library, libcompat. 52.Pp 53The 54.Fn re_comp 55function 56compiles a string into an internal form suitable for pattern matching. 57The 58.Fn re_exec 59function 60checks the argument string against the last string passed to 61.Fn re_comp . 62.Pp 63The 64.Fn re_comp 65function 66returns 0 if the string 67.Fa s 68was compiled successfully; otherwise a string containing an 69error message is returned. If 70.Fn re_comp 71is passed 0 or a null string, it returns without changing the currently 72compiled regular expression. 73.Pp 74The 75.Fn re_exec 76function 77returns 1 if the string 78.Fa s 79matches the last compiled regular expression, 0 if the string 80.Fa s 81failed to match the last compiled regular expression, and \-1 if the compiled 82regular expression was invalid (indicating an internal error). 83.Pp 84The strings passed to both 85.Fn re_comp 86and 87.Fn re_exec 88may have trailing or embedded newline characters; 89they are terminated by 90.Dv NUL Ns s. 91The regular expressions recognized are described in the manual entry for 92.Xr ed 1 , 93given the above difference. 94.Sh DIAGNOSTICS 95The 96.Fn re_exec 97function 98returns \-1 for an internal error. 99.Pp 100The 101.Fn re_comp 102function 103returns one of the following strings if an error occurs: 104.Bd -unfilled -offset indent 105No previous regular expression, 106Regular expression too long, 107unmatched \e(, 108missing ], 109too many \e(\e) pairs, 110unmatched \e). 111.Ed 112.Sh SEE ALSO 113.Xr ed 1 , 114.Xr egrep 1 , 115.Xr ex 1 , 116.Xr fgrep 1 , 117.Xr grep 1 , 118.Xr regex 3 119.Sh HISTORY 120The 121.Fn re_comp 122and 123.Fn re_exec 124functions appeared in 125.Bx 4.0 . 126