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BSD 2.11 - man page for re_comp (bsd section 3)

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REGEX(3)										 REGEX(3)

       re_comp, re_exec - regular expression handler

       char *re_comp(s)
       char *s;

       char *s;

       Re_comp	compiles  a  string into an internal form suitable for pattern matching.  Re_exec
       checks the argument string against the last string passed to re_comp.

       Re_comp 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.

       Re_exec returns 1 if the string s matches the last compiled regular expression, 0  if  the
       string s failed to match the last compiled regular expression, and -1 if the compiled reg-
       ular expression was invalid (indicating an internal error).

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

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

       Re_exec returns -1 for an internal error.

       Re_comp returns one of the following strings if an error occurs:

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

3rd Berkeley Distribution		   May 15, 1985 				 REGEX(3)

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