Google Code Search: Difference between revisions

Revision as of 15:16, 25 July 2016

Latest revision as of 09:30, 30 July 2025

(41 intermediate revisions by 36 users not shown)

Line 1:

{{Short description|Beta product from Google}}

{{Distinguish|Google Code}}

{{Update|date=December 2018}}

{{Infobox Softwarewebsite

|released = October 5, 2006

| name = Google Code Search

| logo = [[Image:Google Code Search.png]]

|screenshot logo_size = 250px

| screenshot =

| caption =

|developer = [[Google]]

| commercial =

|latest_release_version =

| type = [[Search engine]]

|latest_release_date =

| language = All languages

|status = Discontinued

| registration =

|discontinued = 15 Jan 2012

|developer owner = [[Google]]

|operating_system = Any (web based application)

| launch_date = {{Start date and age|2006|10|05}}

|genre = Code search engine

| current_status = Discontinued as of 15 January 2012

|license =

| revenue =

|website = [http://web.archive.org/web/20101112131244/http://www.google.com//codesearch http://www.google.com/codesearch] (archived version from 2010)

| url = www.google.com/codesearch

|Version = Beta

}}

'''Google Code Search''' was a free [[Development stage#Beta|beta]] product from [[Google]] which debuted in [[Google Labs]] on October 5, 2006, allowing web users to search for open-source code on the Internet. GoogleFeatures announcedincluded thatthe Code Search wasability to besearch shutusing downoperators, alongnamely with the Code Search API on January 15{{mono|lang:}}, 2012.<ref>{{cite webmono|last=Horowitz |first=Bradley |url=httppackage://googleblog.blogspot.com/2011/10/fall-sweep.html}}, {{mono|title=Official Bloglicense: A fall sweep |publisher=Googleblog.blogspot.com |date=2011-10-14 |accessdate=2013-07-09}}</ref> The service remained online until March 2013,<ref>https://stackoverflow.com/questions/7778034/replacement-for-google-code-search</ref> and it now returns a [[HTTP 404{{mono|404]]file:}}.

The code available for searching was in various formats including tar.gz, .tar.bz2, .tar, and .zip, [[Concurrent VersioningVersions System|CVS]], [[Subversion (software)|Subversion]], [[Git (software)|git]] and [[Mercurial]] repositories.

Features included the ability to search using operators. These are <tt>lang:</tt>, <tt>package:</tt>, <tt>license:</tt> and <tt>file:</tt>.

Google Code Search covered many open-source projects, and as such is different from the "Code Search for Google Open source projects" that was released afterwards.<ref>{{Cite web|url=https://opensource.googleblog.com/2020/04/code-search-for-google-open-source.html|title=Code Search for Google open source projects|website=Google Open Source Blog|access-date=2020-04-01}}</ref><ref>{{Cite web|url=https://cs.opensource.google/|website=cs.opensource.google|access-date=2020-04-01|title=Google Open Source}}</ref>

The code available for searching was in various formats including tar.gz, .tar.bz2, .tar, and .zip, [[Concurrent Versioning System|CVS]], [[Subversion (software)|Subversion]], [[Git (software)|git]] and [[Mercurial]] repositories.

== Regular expression engine ==

The site allowed the use of [[regular expressionsexpression]]s in queries, which isat that time was not offered by any other search engine for code.{{Citation needed|date=October 2009}} This makes it resemble [[grep]], but over the world's public code. The methodology employed, sometimes called [[trigram search]], combines a [[trigram]] [[Search engine indexing|index]] with a custom-built, [[ReDoS|denial-of-service]] resistant [[regular expression]] engine.<ref>{{URLcite web |url = http://swtch.com/~rsc/regexp/regexp4.html |title = Regular Expression Matching with a Trigram Index (or: How Google Code Search Worked}},) |author = Russ Cox, |date = January 2012 |access-date = 2012-01-26 |archive-url = https://web.archive.org/web/20120128183712/http://swtch.com/~rsc/regexp/regexp4.html |archive-date = 2012-01-28 |url-status = live }}</ref>

In March 2010, the code of [[RE2 (software)|RE2]], the regular expression engine used in Google Code Search, was made open source.<ref>{{cite web|url=https://opensource.googleblog.com/2010/03/re2-principled-approach-to-regular.html|title=RE2: a principled approach to regular expression matching|publisher=|access-date=2016-09-24|archive-url=https://web.archive.org/web/20160927023834/https://opensource.googleblog.com/2010/03/re2-principled-approach-to-regular.html|archive-date=2016-09-27|url-status=live}}</ref>

Google Code Search supported POSIX extended regular expression syntax, excluding back-references, collating elements, and collation classes.

Languages not officially supported could be searched for using the file: operator to match the common file extensions for the language.

== Discontinuation ==

In October 2011, Google announced that Code Search was to be shut down along with the Code Search API.<ref>{{cite web |last = Horowitz |first = Bradley |url = http://googleblog.blogspot.com/2011/10/fall-sweep.html |title = Official Blog: A fall sweep |publisher = Googleblog.blogspot.com |date = 2011-10-14 |accessdate = 2013-07-09 |archive-url = https://web.archive.org/web/20111123221541/http://googleblog.blogspot.com/2011/10/fall-sweep.html |archive-date = 2011-11-23 |url-status = live }}</ref> The service remained online until March 2013,<ref>{{cite web|url=https://stackoverflow.com/questions/7778034/replacement-for-google-code-search|title=Replacement for Google Code Search?|website=Stack Overflow|access-date=2016-07-25|archive-url=https://web.archive.org/web/20171109120559/https://stackoverflow.com/questions/7778034/replacement-for-google-code-search|archive-date=2017-11-09|url-status=live}}</ref> and it now returns a [[HTTP 404|404]].

In January 2012, Google developer Russ Cox published an overview of history and the technical aspects of the tool, and open-sourced a basic implementation of a similar functionality as a set of standalone programs that can run fast indexed regular expression searches over local code.<ref>{{github|google/codesearch}}</ref>

== See also ==

{{Portal|Computer programming}}

* [[Codase]]

* [[Krugle]]

* [[Black Duck Open Hub|Open Hub]] (a merge of Ohloh and [[Koders]])

* [[Merobase]]

* [[OpenGrok]]

* [[Trigram search]]

{{Clear}}

Line 45 ⟶ 55:

== External links ==

* {{Waybackwebarchive |url=https://web.archive.org/web/20101112131244/http://www.google.com//codesearch |date=20101112131244|df=yes12 November 2010 }}

* [https://github.com/google/codesearch Cindex/Csearch] - command-line file search tool, based on ideas from GCS

* [https://code.google.com/p/chromium/codesearch Version of Code Search], limited to the [[Chromium (web browser)|Chromium]] project

{{Google Inc.}}

{{Google Inc.LLC}}

[[Category:Discontinued Google services|Code Search]]

[[Category:Code search engines]]

[[Category:BetaDefunct softwareinternet search engines]]

[[Category:DefunctDiscontinued websitesGoogle services|Code Search]]