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.