fun CharSequence.lastOrNull(): Char?
Returns the last character, or null if the char sequence is empty.
inline fun CharSequence.lastOrNull( predicate: (Char) -> Boolean ): Char?
Returns the last character matching the given predicate, or null if no such character was found.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/last-or-null.html