While generating the new CHM highlights I came across a bug. Seems like the syntax highliter does not like backslashes in strings, or something like that...
This example was on the preg_match_all() page.

The original source:

preg_match_all ("/(<([\w]+)[^>]*>)(.*)(<\/\\2>)/", $html, $matches);

The output of the highlight:

preg_match_all ("/(<([
Warning:  Unexpected character in input:  '\' (ASCII=92) state=1 in E:\phpcvs\phpdoc\htmlhelp\filter_files.php on line 180
w]+)[^>]*>)(.*)(<
Warning:  Unexpected character in input:  '\' (ASCII=92) state=1 in E:\phpcvs\phpdoc\htmlhelp\filter_files.php on line 180
/
Warning:  Unexpected character in input:  '\' (ASCII=92) state=1 in E:\phpcvs\phpdoc\htmlhelp\filter_files.php on line 180

Warning:  Unexpected character in input:  '\' (ASCII=92) state=1 in E:\phpcvs\phpdoc\htmlhelp\filter_files.php on line 180
2>)/", $html, $matches);