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NetBSD 6.1.5 - man page for re_comp (netbsd section 3)

RE_COMP(3)			   BSD Library Functions Manual 		       RE_COMP(3)

NAME
     re_comp, re_exec -- regular expression handler

LIBRARY
     Compatibility Library (libcompat, -lcompat)

SYNOPSIS
     #include <re_comp.h>

     char *
     re_comp(const char *s);

     int
     re_exec(const char *s);

DESCRIPTION
     This interface is made obsolete by regex(3).  It is available from the compatibility
     library, libcompat.

     The re_comp() function compiles a string into an internal form suitable for pattern match-
     ing.  The re_exec() function checks the argument string against the last string passed to
     re_comp().

     The re_comp() function returns 0 if the string s was compiled successfully; otherwise a
     string containing an error message is returned.  If re_comp() is passed 0 or a null string,
     it returns without changing the currently compiled regular expression.

     The re_exec() function returns 1 if the string s matches the last compiled regular expres-
     sion, 0 if the string s failed to match the last compiled regular expression, and -1 if the
     compiled regular expression was invalid (indicating an internal error).

     The strings passed to both re_comp() and re_exec() may have trailing or embedded newline
     characters; they are terminated by NULs.  The regular expressions recognized are described
     in the manual entry for ed(1), given the above difference.

DIAGNOSTICS
     The re_exec() function returns -1 for an internal error.

     The re_comp() function returns one of the following strings if an error occurs:

	   No previous regular expression,
	   Regular expression too long,
	   unmatched \(,
	   missing ],
	   too many \(\) pairs,
	   unmatched \).

SEE ALSO
     ed(1), egrep(1), ex(1), fgrep(1), grep(1), regex(3)

HISTORY
     The re_comp() and re_exec() functions appeared in 4.0BSD.

BSD					   June 4, 1993 				      BSD


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