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index (string_to_search, pattern)

     Usage: Locates the first match of pattern in string_to_search.
            Character positions start with 1. The result is undefined
            if pattern is a null string.  See search_string to search
            a string using regular expressions.

Parameters: String_to_search and pattern .strings..

   Returns: If pattern is found, the position in string_to_search,
            0 if not found.