java - Best way to find a substring in a string

Question

I have a problem where I am trying to search for a substring in string. That substring may or may not be in the string.

str = "hello how are you?"
substr = "how are"

Two ways which I know if can be done are:

1. string.indexOf("how are")
2. regex

But, is there any other "optimized" way? What would you have done?

Can Ruby provide a better answer? Since we use jRuby the answer can be in Ruby or Java.

Answer 1

In Ruby, use the String#include? method:

str = "hello how are you?"
substr = "how are"
str.include? substr 

which returns true.