Extended WordPress Search Engine
by Justin Shreve for WordPress
Currently the search engine included in WordPress is very limited as to what types or categories of data it can locate and how a blog user can employ the system to locate them (search mode). For example, you cannot search blog posts with a simple strategy such as "find A string in category C". It also doesn't support advanced boolean search query formats (grouping, OR, NOT, AND). For these reasons, the WordPress search system needs an overhaul and enhancement...