michelf / php-markdown

				// Fenced code block marker: find matching end marker.

				$fence_indent = strlen($capture[1]); // use captured indent in re

				$fence_re = $capture[2]; // use captured fence in re

				if (preg_match('{^(?>.*\n)*?[ ]{' . ($fence_indent) . '}' . $fence_re . '[ ]*(?:\n|$)}', $text,

					$matches))

				{

					// End marker found: pass text unchanged until marker.

					$parsed .= $tag . $matches[0];

					$text = substr($text, strlen($matches[0]));

				}

				else {

					// No end marker: just skip it.

					$parsed .= $tag;

				}

			}

			// Check for: Indented code block.

			else if ($tag{0} === "\n" || $tag{0} === " ") {

			else if ($tag{0} === "`") {

				// Find corresponding end marker.

				$tag_re = preg_quote($tag);

				if (preg_match('{^(?>.+?|\n(?!\n))*?(?<!`)' . $tag_re . '(?!`)}',

					$text, $matches))

				{

					// End marker found: pass text unchanged until marker.

					$parsed .= $tag . $matches[0];

					$text = substr($text, strlen($matches[0]));

				}

				else {

					// Unmatched marker: just skip it.

					$parsed .= $tag;

				}

			}

			// Check for: Opening Block level tag or

			//            Opening Context Block tag (like ins and del)