从倒数第二个字符开始截取

public static void main(String[] args) {
	String str = "sdfsdf='dfs',d1'fsd'f,s='dfsdfsdfsdf'--";
		
	((("'")));
	((("'",("'")-1)));
	((("'",("'")-1)+1));</span>
	((("'",("'")-1)+1,("'")));
}
//结果：
'--
'dfsdfsdfsdf'--
dfsdfsdfsdf'--
dfsdfsdfsdf