Editing Incubator escapee wiki:External search engines (section)

== Comparison with Wikipedia's search engine ==

The internal search can handle all the logical combinations Google and other major search websites can, using logical combinations of AND, OR and "()". It can search in page titles or with page title prefixes, and in specific [[WP:CATEGORY|categories]] and [[WP:NAMESPACE|namespaces]], or limit a search to pages with specific words in the title or in specific categories or namespaces.

It can also handle parameters an order of magnitude more sophisticated than most external search engines, including user-specified words with variable endings and similar spellings.

The internal search is also able to search all pages for project purposes, whereas external search engines cannot be used on any talk page, a large part of projectspace, and any page tagged as [[WP:NOINDEX|noindex]].

Finally when presenting results, the internal search understands and will link to relevant sections of a page (although to a limited degree some other search engines may do this as well).

===Wikimedia Global Search===
* [[toolforge:global-search|Wikimedia Global Search]], perform [[Elasticsearch]]-based searches across the wikitext of all Wikimedia Foundation (WMF) wikis via [[Wikipedia:WMCS|WMCS]] [[Wikipedia:Toolforge|Toolforge]] and [[wikitech:CloudElastic|Cloud Elastic]] services. Due to potential for abuse of expensive long-running queries (e.g., [[denial-of-service attack|DoS attack]]), [[Wikipedia:SUL|SUL]] login is required.

===Google===
By following the links below, you can use the Google search engine to search Wikipedia – either all languages, or English-only. Google indexes all namespaces except user talk.

* [http://www.google.com/search?q=site:wikipedia.org Search all languages]
* [http://www.google.com/search?q=site:en.wikipedia.org Search the English Wikipedia only]

====How to provide a link to a specific Google Search====
Wikipedia markup allows you to insert links to Google searches by including <tt>google:</tt> as the prefix for the link. This can sometimes be useful on talk pages. It is done like this:

:<tt><nowiki>[[google:Tipster]]</nowiki></tt>.

Which looks like this:

:[[google:Tipster]]

'''Note:''' It is important not to use spaces in the search. To add more parameters to the search, separate them by a plus sign, '''+'''. For a phrase search, use a hyphen (minus sign), '''-''', between each word. E.g. to search for <tt>"Tip of the day"</tt>, use <tt>Tip-of-the-day</tt>.

: ''User's comment:'' It can't really work, other than by accident, as in [[Google:overselling+-wikipedia]] (even when typed in as <tt><nowiki>[[Google:overselling%2B-wikipedia]]</nowiki></tt>—at the very least in Opera [[History of the Opera web browser #Version 8.5|version 8.54]], 2005, if not in all browsers). This is because the plus (<tt>+</tt>) is not meant as [[white-space character]] replacement in Google queries, even if it is used in this role in [[URL encoding]]. The plus is meant merely as a [[Prefix (disambiguation)|prefix]], ''in addition'' to a white-space character. (''[[Cf.]]'' "The minus sign should appear immediately before the word and should be preceded with a space" [http://www.google.com/support/websearch/bin/answer.py?answer=136861]—for a similar issue with the minus.) If the defect I'm talking about turns out to be browser-dependent, just click on [http://www.google.com/search?q=overselling%2B-wikipedia this] to see what I mean.<br /><!--''[[User:6birc|6birc]] ([[User talk:6birc|talk]]) 18:59, 29 April 2009 (UTC)''-->

To provide a link to a Wikipedia-specific search, include <tt>+site:en.wikipedia.org</tt> in the Google link (no spaces before or after), like this:

:<tt><nowiki>[[google:Tip-of-the-day+site:en.wikipedia.org]]</nowiki></tt>.

Which looks like this:

:[[google:Tip-of-the-day+site:en.wikipedia.org]]

To clean up the link so that only the part you want to show is presented, use the pipe, like this:

:<tt><nowiki>[[google:Tipster+site:en.wikipedia.org|"Tip of the day"]]</nowiki></tt>

Which makes it look like this:

:[[google:Tipster+site:en.wikipedia.org|"Tip of the day"]]

==== Google templates ====

Several [[Help:Template|templates]] are available for creating links to various kinds of Google searches and services. These templates allow more options, such as to search for specific keywords, to link to initially blank search forms, and to search on a specific Web site or on a subdirectory within a site. These templates also allow spaces to separate multiple search keywords, so you don't need to use unusual punctuation. Since these templates create links to Google searches, they cannot search on Wikipedia's Talk: namespace (i.e., [[WP:WIAA|article]] [[Help:Talk page|talk pages]]). These searches should work on non-article talk pages. See the documentation for each template for usage details and examples:

* {{Tl|Google}} – basic Google searches; works similarly to the <code>google:</code> [[Help:Interwiki linking|interwiki link]] prefix.
* {{Tl|Google custom}} – Google searches on a specific site, or on a specific subdirectory within a site; allows for searching on particular Wikipedia namespaces, and searching on a specific page and all its [[Help:Subpage|subpages]].
* {{Tl|Google help desk}} – Google search on Wikipedia's [[WP:HD|Help desk]] and its archives.
* {{Tl|Google images}} – [[Google Image Search]].
* {{Tl|Google translation}} – not a search method, but can provide [[machine translation]] between a limited set of languages, using the [[Google Translate]] service.
* {{Tl|Google wikipedia}} – search the entire [[English Wikipedia]] with Google (except for the Talk: namespace).

In most cases you should not use these templates in [[WP:WIAA|articles]] because they violate [[WP:EL#Links normally to be avoided]]. They are appropriate for pages in other namespaces, such as [[Help:Talk page|talk pages]], the [[WP:HD|Help desk]], [[WP:PROJ|project pages]], and so on. If you just want to run some searches without necessarily creating links to them, see the template pages which provide some example search links.

===Yahoo!===
By following the links below, you can use the [[Yahoo!]] search engine to search Wikipedia – either all languages or English-only.

* [http://search.yahoo.com/web/advanced?vs=wikipedia.org Search all Wikipedias with Yahoo!]
* [http://search.yahoo.com/web/advanced?vs=wikipedia.org&fl=1&vl=lang_en Search the English Wikipedia with Yahoo!]

===Copernix.io===
Copernix.io is a geographical search engine allowing users to search places and information from Wikipedia on a map. Users can leave the search bar empty to see all pages within an area or type a query to get subject specific information.

Some useful examples can be found at:
* [http://copernix.io/about Copernix examples and about ]
The main search page is at:
* [http://copernix.io Copernix.io]

===Other===
Here are more [[Wikipedia:Tools]] which make searching more convenient.

[[Category:Searching in Wikipedia]]