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lastIndex

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)
val CharSequence.lastIndex: Int

Returns the index of the last character in the char sequence or -1 if it is empty.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/last-index.html