Question

How to count the occurrences of a word in a string using Kotlin

Answer 1

fun countOccurrences(str: String, word: String): Int {
    return str.split("\\s+".toRegex()).filter { it == word }.count()
}

fun main() {
    val str = "Kotlin programming language. Kotlin cross-platform. Kotlin statically typed"
    val word = "Kotlin"
    
    println("Occurrences of '$word': ${countOccurrences(str, word)}")
}

 
 
    
/*
run:
 
Occurrences of 'Kotlin': 3
  
*/

 

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Answer 2

fun countOccurrences(str: String, word: String): Int {
    val regex = "\\b$word\\b".toRegex()
    
    return regex.findAll(str).count()
}

fun main() {
    val str = "Kotlin programming language. Kotlin cross-platform. Kotlin statically typed"
    val word = "Kotlin"
    
    println("Occurrences of '$word': ${countOccurrences(str, word)}")
}
 
 
    
/*
run:
 
Occurrences of 'Kotlin': 3
  
*/

 

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Answer 3

fun countOccurrences(str: String, word: String): Int {
    return str.split(word).size - 1
}

fun main() {
    val str = "Kotlin programming language. Kotlin cross-platform. Kotlin statically typed"
    val word = "Kotlin"
    
    println("Occurrences of '$word': ${countOccurrences(str, word)}")
}
 
 
    
/*
run:
 
Occurrences of 'Kotlin': 3
  
*/

 

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