re_comp man page on 4.4BSD

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

     re_comp, re_exec — regular expression handler

     #include <unistd.h>

     char *
     re_comp(const char *s);

     re_exec(const char *s);

     This interface is made obsolete by regex(3).

     The re_comp() function compiles a string into an internal form suitable
     for pattern matching.  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 success‐
     fully; 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 com‐
     piled regular expression, 0 if the string s failed to match the last com‐
     piled 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.

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

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

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

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

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

BSD				 June 4, 1993				   BSD

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