Question

How to check if a string contains only English letters in Java

Answer 1

import java.util.regex.Pattern;

public class Main {
    public static boolean isOnlyEnglishLetters(String s) {
        String pattern = "^[a-zA-Z]+$";
        return Pattern.matches(pattern, s);
    }

    public static void main(String[] args) {
        String s1 = "Java";
        System.out.println(isOnlyEnglishLetters(s1));

        String s2 = "Javaジャワ";
        System.out.println(isOnlyEnglishLetters(s2));
    }
}


/*
run:

true
false

*/

 

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