7e6cabd06e
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
121 lines
3.3 KiB
Groff
121 lines
3.3 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)re_comp.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd June 4, 1993
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.Dt RE_COMP 3
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.Os
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.Sh NAME
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.Nm re_comp ,
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.Nm re_exec
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.Nd regular expression handler
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.Sh LIBRARY
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.Lb libcompat
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.Sh SYNOPSIS
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.In unistd.h
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.Ft char *
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.Fn re_comp "const char *s"
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.Ft int
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.Fn re_exec "const char *s"
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.Sh DESCRIPTION
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.Bf -symbolic
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This interface is made obsolete by
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.Xr regex 3 .
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.Ef
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.Pp
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The
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.Fn re_comp
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function
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compiles a string into an internal form suitable for pattern matching.
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The
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.Fn re_exec
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function
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checks the argument string against the last string passed to
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.Fn re_comp .
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.Pp
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The
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.Fn re_comp
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function
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returns 0 if the string
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.Fa s
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was compiled successfully; otherwise a string containing an
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error message is returned.
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If
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.Fn re_comp
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is passed 0 or a null string, it returns without changing the currently
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compiled regular expression.
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.Pp
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The
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.Fn re_exec
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function
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returns 1 if the string
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.Fa s
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matches the last compiled regular expression, 0 if the string
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.Fa s
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failed to match the last compiled regular expression, and \-1 if the compiled
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regular expression was invalid (indicating an internal error).
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.Pp
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The strings passed to both
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.Fn re_comp
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and
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.Fn re_exec
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may have trailing or embedded newline characters;
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they are terminated by
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.Dv NUL Ns s .
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The regular expressions recognized are described in the manual entry for
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.Xr ed 1 ,
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given the above difference.
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.Sh DIAGNOSTICS
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The
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.Fn re_exec
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function
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returns \-1 for an internal error.
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.Pp
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The
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.Fn re_comp
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function
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returns
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.Dq no previous regular expression
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or one of the strings generated by
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.Xr regerror 3 .
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.Sh SEE ALSO
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.Xr ed 1 ,
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.Xr egrep 1 ,
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.Xr ex 1 ,
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.Xr fgrep 1 ,
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.Xr grep 1 ,
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.Xr regex 3
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.Sh HISTORY
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The
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.Fn re_comp
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and
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.Fn re_exec
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functions appeared in
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.Bx 4.0 .
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