STRING* content,STRING* search)
Returns the character number of the first
case-insensitive occurrence of
search in content.
If no occurence is found, 0 is returned.
content - STRING* or char* to be searched.
search - STRING* or char* to search for.
0 - search was not found in content
or position of the first occurrence of search in content, beginning with 1.
STRING* s1 = "Hello World";
temp = str_stri(s1,"world"); // now temp == 7
str_cat, str_cmp, str_cmpi,