module to search for URLs in plain text

 URL::Search searches plain text for URLs and extracts them. It exports (on
 request) the following entities:
 .
 $URL_SEARCH_RE: This variable is the core of this module. It contains a regex
 that matches a URL.
 .
 extract_urls: This function takes a string and returns a list of all
 contained URLs.
 .
 partition_urls: This function takes a string and splits it up into text and
 URL segments.