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    var Regex_Pattern = /^(Mr?s|[MDE]r).[a-zA-Z]+$/;

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    Regex_Pattern = r'^(Mrs|Mr|Ms|Dr|Er)\.[a-zA-Z]+$'
    
    import re
    
    print(str(bool(re.search(Regex_Pattern, input()))).lower())
    
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    Regex_Pattern = r'^(Mr.|Mrs.|Ms.|Dr.|Er.)[a-zA-Z]+$'

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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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    JavaScript:

    var Regex_Pattern = /^(Mr|Mrs|Ms|Dr|Er){1}.[a-zA-Z]+$/;

    pasess all test cases