How to check that a substring occurs more than once?

Question

There is a String variable with two options:

 String string= "RUB 1234";

or

 String string= "RUB 1234 RUB 4567";

A condition is required to check if the second RUB is in this variable.

I need the condition itself. Is it possible to realize this?

If only one RUB, then ... Otherwise ... I need the condition itself
You can count the number of repetitions of a word with the help of regex and then check by count ..

Accepted Answer · 2019-01-14T09:26:21

Using a regular expression, you can check if the RUB occurs more than once. For example:

 if(string.matches(".*RUB.*RUB.*")) { //есть два RUB } else { //один или ноль RUB }

It is possible without regularizers, checking the first and last index:

 if(input.indexOf("RUB")==input.lastIndexOf("RUB")) { //не более одного RUB } else { //более одного RUB }

MBo MBo 14.1k one four 21 · Answer 2 · 2019-01-14T09:31:04

If the task is exactly the same and will not be expanded, then it is enough to run twice a suitable variant of indexOf

  public int indexOf(String str, int fromIndex)

from the zero position and after that found for the first time

2 answers 2