Example extract url from message or text :)

chat_util.java

    public String extractURL(String input)
    {
        if (input.length() == 0)
            return null;

        int[] positionsOfUrl = positionsOfUrl(input);

        return input.substring(positionsOfUrl[0], positionsOfUrl[1]);
    }

    public int[] positionsOfUrl(String input)
    {
        LinkExtractor linkExtractor = LinkExtractor.builder()
                .linkTypes(EnumSet.of(LinkType.URL, LinkType.WWW, LinkType.EMAIL))
                .build();
        Iterable<LinkSpan> links = linkExtractor.extractLinks(input);
        if (links.iterator().hasNext())
        {
            LinkSpan link = links.iterator().next();
            link.getType();        // LinkType.URL
            link.getBeginIndex();  // 17
            link.getEndIndex();

            return new int[]{link.getBeginIndex(), link.getEndIndex()};
        }
        else
            return new int[]{0, 0};
    }

    //Example from unit testing
    @Test
    public void shouldExtractExpectedURL() throws Exception {
        String extractURL = CBUtils.getInstance().extractURL("Hey there's a url: https://www.spotify.com/mx/");

        assertEquals("https://www.spotify.com/mx/", extractURL);
    }

    @Test
    public void shouldReturnEmptyIfIsNoExistURL() throws Exception {
        String extractURL = CBUtils.getInstance().extractURL("Hey there's no a URL");

        assertEquals("", extractURL);
    }