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Java 15:
import java.io.*; import java.util.*; import java.util.regex.Pattern; import java.util.regex.Matcher; public class Solution { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); Pattern pattern = Pattern.compile("^(Mr\\.|Mrs\\.|Ms\\.|Dr\\.|Er\\.)([a-z]|[A-Z])+$"); Matcher matcher = pattern.matcher(scanner.nextLine()); System.out.println(matcher.find()); } }
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Java 15: