inline fun CharSequence.takeWhile( predicate: (Char) -> Boolean ): CharSequence
Returns a subsequence of this char sequence containing the first characters that satisfy the given predicate.
inline fun String.takeWhile( predicate: (Char) -> Boolean ): String
Returns a string containing the first characters that satisfy the given predicate.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/take-while.html