@Test public void url2numTest() {

	String num = "2003.02320";
	String url = "https://arxiv.org/abs/2003.02320";
	String x;
	x = Arxiv.url2num(url);
	assertTrue(num.contentEquals(x));
	
	url = "https://arxiv.org/pdf/2003.02320.pdf";
	x = Arxiv.url2num(url);
	assertTrue(num.contentEquals(x));
	
	url = "https://arxiv.org/abs/2003.02320v1";
	x = Arxiv.url2num(url);
	System.out.println(x);
	assertTrue(num.contentEquals(x));
	
	url = "http://arxiv.org/abs/0811.3701";
	x = Arxiv.url2num(url);
	System.out.println(x);
	assertTrue("0811.3701".contentEquals(x));

}