package com.zzh.day1;
public class demo5 {
public static void main(String[] args){
//POSIX style;img/POSIXStyle.png
System.out.println("a".matches("\\p{Lower}"));
/*
* 边界匹配,img/BoundaryMatcher.png
* */
System.out.println("hello sir".matches("^h.*"));//^ the beginning of a line
System.out.println("hello sir".matches(".*ir$"));//$ the end of a line
System.out.println("hello sir".matches("^h[a-z]{4}\\b.*"));//\b a word boundary
System.out.println("hellosir".matches("^h[a-z]{4}\\B.*"));
/*
* 空白行
* */
System.out.println(" \n".matches("^\\s&&[^\\n].*\\n$"));
}
}
输出结果： 1 true 2 true 3 true 4 true 5 true 6 true
{Lower}表示小写
