match_pos.i1p.v = strstr_nocase(source_string.i1a.r, substring.i1a.r)

	This routine finds the first occurrence of one string within another
	ignoring the case of the strings.

	source_string	string to be searched
	substring	substring to search for

	This function returns status values as follows:

	NULL			string not found
	otherwise		address of matching substring

	This function requires the following include files:


	Related functions:

	strstr, str_find_string_c, str_find_last_string_c,
	str_find_character_c, str_find_character_set_c,
	str_regexp_find_string_c, str_regexp_compile_pattern_c,
	str_regexp_free_pattern, str_regexp_compare,
	str_regexp_compare_nocase, str_regexp_replace_string_c,
	str_replace_string_c, str_replace_bracketed_c, str_replace_char_c,
	str_replace_char_set_c, str_compare_n_nocase_c,
	str_compare_nocase, strncmp, strcmp, strncmx, str_split_c,
	str_split_by_columns_c, str_get_bracketed_c, str_character_count_c,

	C/C++ usage:

	static const char	source_string[] = "This is a string.";
	static const char	substring[] = "is a";
	char	*string_pos;

	string_pos = strstr_nocase(source_string,substring);