• Global(ly) Search And Replace: (in computing) SAR has long meant the initialism Search And Replacehttp://dept.seattlecolleges.com/ssccwrite/pickups/gloss~1.htm, the process of searching for a word or string in a text stream and replacing the search string with a replacement string— conditionally (CSAR) or unconditionally (USAR
  USAR
  USAR may refer to one of the following:*Unconditional Search and Replace, an initialism used in computing for features in text editors and computer operating systems...
  
  ) — also sometimes called 'GSAR', or Global Search And Replace.

• The process used in some command line processing as in the underlying Windows DOS kernal or Unix
  Unix
  Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, and Joe Ossanna...
  
  , general search utilities like Windows Explorer.exe (Not to be confused with Internet Explorer (MSIE) — a special mode of which is launched from within the windows start button menu system), and in Text editors of searching for a word or string in a text stream, sometimes allowing the search object to include wildcard character
  Wildcard character
  -Telecommunication:In telecommunications, a wildcard character is a character that may be substituted for any of a defined subset of all possible characters....
  
  s, and replacing the search string with a replacement string— Such features either allow for a confirmation or veto of replacing each instance of a string string found, so are 'searching globally' and replacing 'conditionally' (CSAR) (Like a spell checker), where the opposite mode is to replace without asking for confirmation, or unconditionally USAR
  USAR
  USAR may refer to one of the following:*Unconditional Search and Replace, an initialism used in computing for features in text editors and computer operating systems...
  
   / 'GSAR', for Global Search And Replace.

Examples

• The MS-Windows utility Notepad.exe does USAR/GSAR or SAR/CSAR using [CTRL][H] and mouse commands.
• The Vi
  Vi
  vi is a screen-oriented text editor originally created for the Unix operating system. The portable subset of the behavior of vi and programs based on it, and the ex editor language supported within these programs, is described by the Single Unix Specification and POSIX.The original code for vi...
  
  (M) text editor uses the string : %s/text to replace/text to replace with/g