fun CharSequence.firstOrNull(): Char?
Returns the first character, or null if the char sequence is empty.
inline fun CharSequence.firstOrNull( predicate: (Char) -> Boolean ): Char?
Returns the first character matching the given predicate, or null if character was not found.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/first-or-null.html