JAVA正则表达式判断字符串不能为空和空格

本文介绍JAVA正则表达式判断字符串不能为空和空格，拿走不谢！

正则表达式如下：

String s = "";
String s2 = "   ";
String re = "^\\s*$";
System.out.println(s.matches(re)); //true
System.out.println(s2.matches(re));//true

验证如下：

public static void main(String[] args) {
	String s = " ";
	String re = "^\\s*$";
	System.out.println(s.matches(re));
	
	s = "A";
	System.out.println(s.matches(re));
	
	s = " x";
	System.out.println(s.matches(re));
	
	s = "a ";
	System.out.println(s.matches(re));
	
	s = "   ";
	System.out.println(s.matches(re));
	
	s = "";
	System.out.println(s.matches(re));
}

得到判断结果：

true
false
false
false
true
true