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Google Code Search


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Not to be confused with Google Code.






























Google Code Search
Google Code Search.png
Type of site
 Search engine
Available in All languages
Owner Google
Website www.google.com/codesearch
Launched October 5, 2006; 12 years ago (2006-10-05)
Current status Discontinued as of 15 January 2012

Google Code Search was a free 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. Features included the ability to search using operators, namely lang:, package:, license: and file:.


The code available for searching was in various formats including tar.gz, .tar.bz2, .tar, and .zip, CVS, Subversion, git and Mercurial repositories.




Contents






  • 1 Regular expression engine


  • 2 Discontinuation


  • 3 See also


  • 4 References


  • 5 External links





Regular expression engine[edit]


The site allowed the use of regular expressions in queries, which at the time was not offered by any other search engine for code.[citation needed] This makes it resemble grep, but over the world's public code. The methodology employed combines a trigram index with a custom-built, denial-of-service resistant regular expression engine.[1]


In March 2010, the code of RE2, the regular expression engine used in Google Code Search, was made open source.[2]


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[edit]


In October 2011, Google announced that Code Search was to be shut down along with the Code Search API.[3] The service remained online until March 2013,[4] and it now returns a 404.


In January 2012, 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.[5]



See also[edit]





  • Sourcegraph [1]

  • Codase

  • Krugle


  • Open Hub (a merge of Ohloh and Koders)

  • Merobase

  • OpenGrok


  • SearchCode [2]




References[edit]





  1. ^ Russ Cox (January 2012). "Regular Expression Matching with a Trigram Index (or: How Google Code Search Worked)"..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"""""""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}


  2. ^ "RE2: a principled approach to regular expression matching".


  3. ^ Horowitz, Bradley (2011-10-14). "Official Blog: A fall sweep". Googleblog.blogspot.com. Retrieved 2013-07-09.


  4. ^ "Replacement for Google Code Search?". Stack Overflow.


  5. ^ codesearch on GitHub




External links[edit]




  • Archived 12 November 2010 at the Wayback Machine


  • Cindex/Csearch - command-line file search tool, based on ideas from GCS


  • Version of Code Search, limited to the Chromium project











Retrieved from "https://en.wikipedia.org/w/index.php?title=Google_Code_Search&oldid=873948144"





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