How to convert from URL string to HTML anchor tag

Question

I want to convert URL string in email contents sent by Q2A into HTML. It is not converted even if I carry out sample code below. $urltext and $urlhtml are same... Please teach me condition converted in the regular expression of qa_html_convert_urls() function. 

$urltext = 'http://localhost/aaa/bbb/ccc';

$viewer = qa_load_viewer($urltext, 'html');

$utlhtml = $viewer->get_html($urltext, 'html', array('showurllinks' => true));

Best regards.

Answer 1

I got it. This may be bug that local host cannot handle.

http://localhost.xxx   > OK
http://localhost   > NG