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search_string (patt, str, [len], [re], [case])

     Usage: Searches a string for a pattern.

Parameters: Patt .string. is the pattern to search for.
            Str .string. is the string to be searched.
            Len .int. returns the length of the match.
            Re .int. is 0 to disable regular expressions, non-0 or
               omitted to use them.
            Case .int. is 0 to disable case sensitivity, non-0 or
               omitted to enable it.

   Returns: The position .int. in the string if a match occurred
            (first position is 1), 0 if the search fails.