How to find the Index of Last Occurrence of Substring in Ruby - Step by Step Examples

How to find the Index of Last Occurrence of Substring in Ruby ?

To find the index of the last occurrence of a substring in Ruby, you can use the rindex method of the String class.

In this example,

We create a string variable str with a string value.
We use the rindex method of the string object to find the index of the last occurrence of a specific substring within str.
The rindex method returns the index of the last occurrence of the substring in the string.
Finally, we print the index.

str = "Hello World, Hello Ruby"
last_index = str.rindex('H')
puts "Last index of substring is: #{last_index}"

Last index of substring is: 13

In this example,

We create two string variables str1 and str2 with different values.
We use the rindex method of str1 to find the index of the last occurrence of str2 within str1.
The rindex method returns the index of the last occurrence of str2 in str1.
Finally, we print the index.

str1 = "apple banana cherry banana"
str2 = "banana"
last_index = str1.rindex(str2)
puts "Last index of substring is: #{last_index}"

Last index of substring is: 20

In this tutorial, we learned How to find the Index of Last Occurrence of Substring in Ruby language with well detailed examples.