// 1.1Ͱग़དྷΔΑ͏ʹͳͬͨ͜ͱɹଞͷมͷؔࢀর
val numberRegex = "\\d+".toRegex()
numbers.filter(numberRegex::matches)
// 1.0Ͱग़དྷͨ͜ͱୡ fun isAbc(str: String) = str.equals("abc", true)
numbers.filter(::isAbc)
numbers.map(String::toUpperCase)
numbers.filter { numberRegex.matches(it) }