正则表达式

	//正整数
		String ss = "123";
		System.out.println(ss.matches("^\\d{3}$"));
		//负整数
		ss = "-123";
		System.out.println(ss.matches("^-\\d+$"));
		//正负整数
		ss = "-123";
		System.out.println(ss.matches("^-{0,1}\\d{3}$"));
		//正负整数或正负浮点数
		ss = "-123.1";
		System.out.println(ss.matches("^-{0,1}\\d*(.\\d+){0,1}$"));
		//正浮点数
		ss = "123.01";
		System.out.println(ss.matches("^\\d*.\\d+$"));
		//正数或正浮点数
		ss = "1231.1";
		System.out.println(ss.matches("^\\d*(.\\d+){0,1}$"));
		//负数或负浮点数
		ss = "-1231.1";
		System.out.println(ss.matches("^-\\d+(.\\d+){0,1}$"));
				
		//英文字符 小字
		ss="abc";
		System.out.println(ss.matches("^[a-z]{0,3}$"));
		//英文大写
		ss="ABC";
		System.out.println(ss.matches("^[A-Z]{0,3}$"));
		//英文大小写
		ss="ABCasdfsaf";
		System.out.println(ss.matches("^[A-Za-z]*$"));
				
		
		//汉字
		ss="中国";
		System.out.println(ss.matches("^[\\u4e00-\\u9fa5]{0,3}$"));
		//任意字符
		ss="|\\()*";
		System.out.println(ss.matches("^\\S*$"));