How do I count the number of times a sequence occurs in a Java string? [closed]

Question

I have a String that looks like:

"Hello my is Joeseph. It is very nice to meet you. What a wonderful day it is!". 

I want to count the number of times is is in the string.

How can I do this in Java?

Answer 1

An easy way is using Apache StringUtils countMatches

StringUtils.countMatches("Hello my is Joeseph. It is very nice to meet you. What a wonderful day it is!", "is");

Answer 2

int index = input.indexOf("is");
int count = 0;
while (index != -1) {
    count++;
    input = input.substring(index + 1);
    index = input.indexOf("is");
}
System.out.println("No of *is* in the input is : " + count);