使用可选的区号为美国电话号码创建正则表达式

import java.util.regex.Matcher;

import java.util.regex.Pattern;


public class Main {/*from n o w j a v a . c o m - 时代Java*/

  public static void main(String[] args) {

    Pattern pattern = Pattern.compile("(\\(\\d{3}\\)\\s?)?\\d{3}-\\d{4}");

    Matcher matcher = pattern.matcher("555-1234");

    if (matcher.matches())

      System.out.println("Match.");

    else

      System.out.println("Does not match.");

  }


}