indexOf
fun CharSequence.indexOf(
char: Char,
startIndex: Int = 0,
ignoreCase: Boolean = false
): Int(source)
Returns the index within this string of the first occurrence of the specified character, starting from the specified startIndex.
Parameters
ignoreCase - true to ignore character case when matching a character. By default false.
Return An index of the first occurrence of char or -1 if none is found.
fun CharSequence.indexOf(
string: String,
startIndex: Int = 0,
ignoreCase: Boolean = false
): Int(source)
Returns the index within this char sequence of the first occurrence of the specified string, starting from the specified startIndex.
import java.util.Locale
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
fun matchDetails(inputString: String, whatToFind: String, startIndex: Int = 0): String {
val matchIndex = inputString.indexOf(whatToFind, startIndex)
return "Searching for '$whatToFind' in '$inputString' starting at position $startIndex: " +
if (matchIndex >= 0) "Found at $matchIndex" else "Not found"
}
val inputString = "Never ever give up"
val toFind = "ever"
println(matchDetails(inputString, toFind)) // Searching for 'ever' in 'Never ever give up' starting at position 0: Found at 1
println(matchDetails(inputString, toFind, 2)) // Searching for 'ever' in 'Never ever give up' starting at position 2: Found at 6
println(matchDetails(inputString, toFind, 10)) // Searching for 'ever' in 'Never ever give up' starting at position 10: Not found
//sampleEnd
}Parameters
ignoreCase - true to ignore character case when matching a string. By default false.
Return An index of the first occurrence of string or -1 if none is found.