URIish: fixed full uri pattern not expecting end of line after host name

Bug: 483326
Change-Id: I8b6e3eb648c8ec2c38f73de22382537b1276b779
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>

org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/URIishTest.java

 			}
 		}
 	}
+
+	@Test
+	public void testStringConstructor() throws Exception {
+		String str = "http://example.com/";
+		URIish u = new URIish(str);
+		assertEquals("example.com", u.getHost());
+		assertEquals("/", u.getPath());
+		assertEquals(str, u.toString());
+
+		str = "http://example.com";
+		u = new URIish(str);
+		assertEquals("example.com", u.getHost());
+		assertEquals("", u.getPath());
+		assertEquals(str, u.toString());
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/transport/URIish.java

 			+ OPT_PORT_P //
 			+ "(" // open a group capturing the user-home-dir-part //$NON-NLS-1$
 			+ (USER_HOME_P + "?") //$NON-NLS-1$
-			+ "[\\\\/])" //$NON-NLS-1$
+			+ "(?:" // start non capturing group for host //$NON-NLS-1$
+					// separator or end of line
+			+ "[\\\\/])|$" //$NON-NLS-1$
+			+ ")" // close non capturing group for the host//$NON-NLS-1$
+					// separator or end of line
 			+ ")?" // close the optional group containing hostname //$NON-NLS-1$
 			+ "(.+)?" //$NON-NLS-1$
 			+ "$"); //$NON-NLS-1$
 
 		if (getPath() != null) {
 			if (getScheme() != null) {
-				if (!getPath().startsWith("/")) //$NON-NLS-1$
+				if (!getPath().startsWith("/") && !getPath().isEmpty()) //$NON-NLS-1$
 					r.append('/');
 			} else if (getHost() != null)
 				r.append(':');
 	 */
 	public String getHumanishName() throws IllegalArgumentException {
 		String s = getPath();
-		if ("/".equals(s)) //$NON-NLS-1$
+		if ("/".equals(s) || "".equals(s)) //$NON-NLS-1$
 			s = getHost();
-		if ("".equals(s) || s == null) //$NON-NLS-1$
+		if (s == null) // $NON-NLS-1$
 			throw new IllegalArgumentException();
 
 		String[] elements;