Appendix B   Appendix B Deprecated Features


This appendix lists the features that are deprecated as of JavaScript 15.

• RegExp Properties

  The following properties are deprecated.
  

  
  
  

  Property	Description
  $1, ..., $9	Parenthesized substring matches, if any.
  $_	See input.
  $*	See multiline.
  $&	See lastMatch.
  $+	See lastParen.
  $`	See leftContext.
  $'	See rightContext.
  input	The string against which a regular expression is matched.
  lastMatch	The last matched characters.
  lastParen	The last parenthesized substring match, if any.
  leftContext	The substring preceding the most recent match.
  rightContext	The substring following the most recent match.

  The following are now properties of RegExp instances, no longer of the RegExp object.
  

  
  
  

  Property	Description
  global	Whether or not to test the regular expression against all possible matches in a string, or only against the first.
  ignoreCase	Whether or not to ignore case while attempting a match in a string.
  lastIndex	The index at which to start the next match.
  multiline	Whether or not to search in strings across multiple lines.
  source	The text of the pattern.

• RegExp Methods

  The compile method is deprecated.

  The valueOf method is no longer specialized for RegExp. Use Object.valueOf.

• Escape sequences

  Octal escape sequences (\ followed by one, two, or three octal digits) are deprecated in string and regular expression literals.

  The escape and unescape functions are deprecated. Use encodeURI, encodeURIComponent, decodeURI or decodeURIComponent to encode and decode escape sequences for special characters.