_MarkdownExtra_TmpImpl::doImages PHP Method

    protected function doImages($text)
    {
        #
        # Turn Markdown image shortcuts into <img> tags.
        #
        #
        # First, handle reference-style labeled images: ![alt text][id]
        #
        $text = preg_replace_callback('{
			(				# wrap whole match in $1
			  !\\[
				(' . $this->nested_brackets_re . ')		# alt text = $2
			  \\]

			  [ ]?				# one optional space
			  (?:\\n[ ]*)?		# one optional newline followed by spaces

			  \\[
				(.*?)		# id = $3
			  \\]

			)
			}xs', array($this, '_doImages_reference_callback'), $text);
        #
        # Next, handle inline images:  ![alt text](url "optional title")
        # Don't forget: encode * and _
        #
        $text = preg_replace_callback('{
			(				# wrap whole match in $1
			  !\\[
				(' . $this->nested_brackets_re . ')		# alt text = $2
			  \\]
			  \\s?			# One optional whitespace character
			  \\(			# literal paren
				[ \\n]*
				(?:
					<(\\S*)>	# src url = $3
				|
					(' . $this->nested_url_parenthesis_re . ')	# src url = $4
				)
				[ \\n]*
				(			# $5
				  ([\'"])	# quote char = $6
				  (.*?)		# title = $7
				  \\6		# matching quote
				  [ \\n]*
				)?			# title is optional
			  \\)
			  (?:[ ]? ' . $this->id_class_attr_catch_re . ' )?	 # $8 = id/class attributes
			)
			}xs', array($this, '_doImages_inline_callback'), $text);
        return $text;
    }