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

    protected function doCodeBlocks($text)
    {
        #
        #    Process Markdown `<pre><code>` blocks.
        #
        $text = preg_replace_callback('{
				(?:\\n\\n|\\A\\n?)
				(	            # $1 = the code block -- one or more lines, starting with a space/tab
				  (?>
					[ ]{' . $this->tab_width . '}  # Lines must start with a tab or a tab-width of spaces
					.*\\n+
				  )+
				)
				((?=^[ ]{0,' . $this->tab_width . '}\\S)|\\Z)	# Lookahead for non-space at line-start, or end of doc
			}xm', array(&$this, '_doCodeBlocks_callback'), $text);
        return $text;
    }