org\parser\driver\Markdown::stripLinkDefinitions PHP Метод

    protected function stripLinkDefinitions($text)
    {
        #
        # Strips link definitions from text, stores the URLs and titles in
        # hash references.
        #
        $less_than_tab = $this->tab_width - 1;
        # Link defs are in the form: ^[id]: url "optional title"
        $text = preg_replace_callback('{
							^[ ]{0,' . $less_than_tab . '}\\[(.+)\\][ ]?:	# id = $1
							  [ ]*
							  \\n?				# maybe *one* newline
							  [ ]*
							(?:
							  <(.+?)>			# url = $2
							|
							  (\\S+?)			# url = $3
							)
							  [ ]*
							  \\n?				# maybe one newline
							  [ ]*
							(?:
								(?<=\\s)			# lookbehind for whitespace
								["(]
								(.*?)			# title = $4
								[")]
								[ ]*
							)?	# title is optional
							(?:\\n+|\\Z)
			}xm', array(&$this, '_stripLinkDefinitions_callback'), $text);
        return $text;
    }