Regex for Extracting URLs in Plain Text

Here is a Regex for extracting URLs from text. However, these links will not already be hyperlinked or source attribtues from images or iframes. This example is in PHP. I was trying to format a Wordpress page to auto hyperlink but preserve embeded images, iframes, etc. Wordpress does some funky stuff w/ regard to formatting, which is why I ended up going with the nl2br function and then removing double instances. A little hacky but it seems to work. $0', $content); $html = nl2br(html_entity_decode(esc_html($content))); $html = str_replace('

', ' ', $html); echo $html;