strstr

Search a substring in a string
     str    - input string
     substr - substring to search
     icase  - is case-insensitive search?
returns: 0..n - index in the 'str' where the substring starts
         -1   - if the substring is not found
Thread-safe function.

long strstr(string str, string substr, bool icase=false);
#define stristr(str, substr) strstr((str), (substr), 1)