How to find the Indices of All Occurrences of Substring in Kotlin - Step by Step Examples

How to find the Indices of All Occurrences of Substring in Kotlin ?

Answer

To find the indices of all occurrences of a substring in Kotlin, you can use the findAll method of the Regex class combined with the map function to extract the indices.

✐ Examples

1 Find Indices of All Occurrences in String

In this example,

We create a string variable str with a string value.
We use the findAll method of the Regex class to find all occurrences of a specific substring within str.
We then use the map function to extract the indices of these occurrences.
Finally, we print the indices.

Kotlin Program

fun main() {
    val str = "Hello Hello Hello"
    val regex = Regex("Hello")
    val indices = regex.findAll(str).map { it.range.first }
    println("Indices of all occurrences: ${indices.toList()}")
}

Output

Indices of all occurrences: [0, 6, 12]

2 Find Indices of All Occurrences in Another String

In this example,

We create two string variables str1 and str2 with different values.
We use the findAll method of the Regex class to find all occurrences of str2 within str1.
We then use the map function to extract the indices of these occurrences.
Finally, we print the indices.

Kotlin Program

fun main() {
    val str1 = "apple banana cherry banana"
    val str2 = "banana"
    val regex = Regex(str2)
    val indices = regex.findAll(str1).map { it.range.first }
    println("Indices of all occurrences: ${indices.toList()}")
}

Output

Indices of all occurrences: [6, 20]

Summary

In this tutorial, we learned How to find the Indices of All Occurrences of Substring in Kotlin language with well detailed examples.

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How to find the Indices of All Occurrences of Substring in Kotlin - Step by Step Examples

How to find the Indices of All Occurrences of Substring in Kotlin ?

Answer

✐ Examples

1 Find Indices of All Occurrences in String

Kotlin Program

Output

2 Find Indices of All Occurrences in Another String

Kotlin Program

Output

Summary

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