使用Java regexp匹配(例如)Unicode字母

import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class UnicodeLetterMatcher {
  public static void main(String[] args) {
    String text = "你好，世界!";
    Pattern pattern = Pattern.compile("^[\\p{L}]+$");
    Matcher matcher = pattern.matcher(text);
    if (matcher.find()) {
      System.out.println("The text contains only Unicode letters.");
    } else {
      System.out.println("The text contains other characters than Unicode letters.");
    }
  }
}