SearchSuite is a userscript that provides user control over search results: it can strip them down to a single-spaced list, sort, and more. Most of its features are presented as menu item toggles to turn each feature on/off. Each menu-item-controlled feature works on the output of all the others, in both their on and off states. Feedback and feature suggestions welcome.
Do you have need for a specialized script that doesn't exist yet, or have an idea for a cool new script or gadget? Post requests and ideas at Wikipedia:User scripts/Requests.
Wikipedia:Typo Team/moss just got a fresh batch (from the July 20, 2018 database dump) of articles with misspelled words, and words missing from Wiktionary. Stop by and experience the satisfaction of fixing all the misspellings in an article on the topic of your choice!
Searching Wikipedia with regular expressions (regex)
Searching with regex online
To search Wikipedia live with regular expressions, use the WP:INSOURCE#insource: parameter, followed by your regex search string enclosed in forward slashes, like this: /regular expression/. Here is an example:
insource searches the wikitext version of articles, and so, wikiformatting codes can be included in the search string. If any characters you wish to find are used as special characters within regex, they will need to be "escaped" by preceding each with a backslash. For a cheat sheet on writing regexes, see Wikipedia:AutoWikiBrowser/Regular expression.
For case insensitive searches, include an "i" after the closing forward slash.
Searching with regex offline
To search all of Wikipedia offline using regex, you need to download the Wikipedia database and do the search offline with AutoWikiBrowser's Database Scanner. Activate it from the tools menu in AutoWikiBrowser (AWB). It returns the names of the pages that match your query, which you can have sent directly to AWB's list maker (then you can use AWB to view them all). The Database Scanner has many features, and each query can be easily configured to match, exclude, specify namespaces, ignore redirects, etc. as you see fit.
Other methods of searching Wikipedia with regular expressions
WikEd, the full-featured Wikipedia integrated text or for Firefox, Safari, and Google Chrome web browsers, can do regex searches within the current page (in the window). Enable WikEd from your user Preferences in Gadgets.
AutoWikiBrowser can do regex search/replaces, on a list of articles that you provide it.