package com.zzh.day1;
public class practice {
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("aaa 8888c".matches(".*\\d{4}."));
System.out.println("aaa 8888c".matches(".*\\b\\d{4}."));
System.out.println("aaa8888c".matches(".*\\d{4}."));
System.out.println("aaa8888c".matches(".*\\b\\d{4}."));
}
}
小练习而已 输出结果：
true true true false
