用正则表达式提取区号

用正则表达式提取区号

import Matcher;
import Pattern;public class Main {public static void main(String[] args) {System.out.println(isNumber("1001-5226656555"));}public static String isNumber(String s) {// 提取一个区号String regex = "^(\d{1,4})\-(\d{5,})$";Pattern p = Patternpile(regex);Matcher m = p.matcher(s);if (m.matches()) {up(1);}return null;}
}

结果：1001