1994-05-27 05:00:24 +00:00
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.\" 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\"
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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 SYNOPSIS
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.Fd #include <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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This interface is made obsolete by
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.Xr regex 3 .
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1995-04-10 18:48:06 +00:00
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It is available from the compatibility library, libcompat.
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1994-05-27 05:00:24 +00:00
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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. 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 one of the following strings if an error occurs:
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.Bd -unfilled -offset indent
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No previous regular expression,
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Regular expression too long,
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unmatched \e(,
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missing ],
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too many \e(\e) pairs,
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unmatched \e).
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.Ed
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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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1997-01-20 23:23:22 +00:00
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.Xr ex 1 ,
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1994-05-27 05:00:24 +00:00
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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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