str_is_possible_regexp_pattern_c

	status.i4.v = str_is_possible_regexp_pattern_c(string.i1a.r
						       [,length.i4.v]
						       [,use_extended.i4.v]

	This routine checks a string to determine if it could be a
	regular expression pattern.

	string		string to check
	[length]	length of the string
			(If a value of 0 is passed for this argument,
			 the string argument will be treated as a
			 null terminated string.)
			(default is 0)
	[use_extended]	use extended regular expressions flag
			(TRUE -> use extended regular expressions,
			 FALSE -> don't use extended regular expressions
				  (default))

	This function returns status values as follows:

	TRUE			string could be used as a match pattern
	FALSE			string doesn't appear to be a match pattern

	This function requires the following include files:

	cbslib_h

	Related functions:

	str_regexp_compare, str_regexp_compare_nocase,
	str_regexp_compile_pattern_c, str_regexp_free_pattern,
	str_regexp_find_string_c

	C/C++ usage:

	static const char	string[] = "string";
	int	status;
	int	length = 0;
	int	use_extended = FALSE;

	status = str_is_possible_regexp_pattern_c(string,length,use_extended);