This tests for a bug where quotes escaped by PHP when using preg_replace with the /e modifier must be correctly unescaped (hence the _UnslashQuotes function found only in PHP Markdown).

Headers below should appear exactly as they are typed (no backslash added or removed).

Header "quoted\" again \""

Test with tabs for _Detab:

Code    'block' with    some    "tabs"  and "quotes"