检查字符串在Java中的格式是否正确

import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class StringFormatChecker {
    public static boolean checkFormat(String input, String pattern) {
        Pattern regex = Pattern.compile(pattern);
        Matcher matcher = regex.matcher(input);
        return matcher.matches();
    }

    public static void main(String[] args) {
        String input = "example123";
        String pattern = "[a-zA-Z]+[0-9]+";
        boolean isFormatCorrect = checkFormat(input, pattern);
        System.out.println("String format is correct: " + isFormatCorrect);
    }
}