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+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)re_comp.3	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt RE_COMP 3
+.Os
+.Sh NAME
+.Nm re_comp ,
+.Nm re_exec
+.Nd regular expression handler
+.Sh LIBRARY
+.Lb libcompat
+.Sh SYNOPSIS
+.In unistd.h
+.Ft char *
+.Fn re_comp "const char *s"
+.Ft int
+.Fn re_exec "const char *s"
+.Sh DESCRIPTION
+.Bf -symbolic
+This interface is made obsolete by
+.Xr regex 3 .
+.Ef
+.Pp
+The
+.Fn re_comp
+function
+compiles a string into an internal form suitable for pattern matching.
+The
+.Fn re_exec
+function
+checks the argument string against the last string passed to
+.Fn re_comp .
+.Pp
+The
+.Fn re_comp
+function
+returns 0 if the string
+.Fa s
+was compiled successfully; otherwise a string containing an
+error message is returned.
+If
+.Fn re_comp
+is passed 0 or a null string, it returns without changing the currently
+compiled regular expression.
+.Pp
+The
+.Fn re_exec
+function
+returns 1 if the string
+.Fa s
+matches the last compiled regular expression, 0 if the string
+.Fa s
+failed to match the last compiled regular expression, and \-1 if the compiled
+regular expression was invalid (indicating an internal error).
+.Pp
+The strings passed to both
+.Fn re_comp
+and
+.Fn re_exec
+may have trailing or embedded newline characters;
+they are terminated by
+.Dv NUL Ns s .
+The regular expressions recognized are described in the manual entry for
+.Xr ed 1 ,
+given the above difference.
+.Sh DIAGNOSTICS
+The
+.Fn re_exec
+function
+returns \-1 for an internal error.
+.Pp
+The
+.Fn re_comp
+function
+returns
+.Dq no previous regular expression
+or one of the strings generated by
+.Xr regerror 3 .
+.Sh SEE ALSO
+.Xr ed 1 ,
+.Xr egrep 1 ,
+.Xr ex 1 ,
+.Xr fgrep 1 ,
+.Xr grep 1 ,
+.Xr regex 3
+.Sh HISTORY
+The
+.Fn re_comp
+and
+.Fn re_exec
+functions appeared in
+.Bx 4.0 .