What is the fastest analyzer?

If I implement my own methods in my program to clean the string to be indexed from digits and special characters and other characters that are not required in search so all I am left with in this string is simple words separated by spaces. Now if I would like to tokenize this string in the fastest possible way during the creation of index then which analyzer is best suited for this? Because all the non-required characters and symbols have already been removed.

Thanks in advance.

I think standard analyzer will be the best for your case.