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.\" 4. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)re_comp.3 8.1 (Berkeley) 6/4/93 29.\" $FreeBSD$ 30.\" 31.Dd June 4, 1993 32.Dt RE_COMP 3 33.Os 34.Sh NAME 35.Nm re_comp , 36.Nm re_exec 37.Nd regular expression handler 38.Sh LIBRARY 39.Lb libcompat 40.Sh SYNOPSIS 41.In unistd.h 42.Ft char * 43.Fn re_comp "const char *s" 44.Ft int 45.Fn re_exec "const char *s" 46.Sh DESCRIPTION 47.Bf -symbolic 48This interface is made obsolete by 49.Xr regex 3 . 50.Ef 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. 69If 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