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Appendix B
Appendix B Deprecated Features
This appendix lists the features that are deprecated as of JavaScript 15.
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RegExp Properties
The following properties are deprecated.
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Property
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Description
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$1, ..., $9
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Parenthesized substring matches, if any.
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$_
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See input.
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$*
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See multiline.
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$&
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See lastMatch.
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$+
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See lastParen.
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$`
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See leftContext.
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$'
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See rightContext.
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input
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The string against which a regular expression is matched.
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lastMatch
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The last matched characters.
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lastParen
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The last parenthesized substring match, if any.
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leftContext
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The substring preceding the most recent match.
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rightContext
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The substring following the most recent match.
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The following are now properties of RegExp instances, no longer of the RegExp object.
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Property
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Description
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global
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Whether or not to test the regular expression against all possible matches in a string, or only against the first.
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ignoreCase
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Whether or not to ignore case while attempting a match in a string.
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lastIndex
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The index at which to start the next match.
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multiline
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Whether or not to search in strings across multiple lines.
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source
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The text of the pattern.
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RegExp Methods
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The compile method is deprecated.
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The valueOf method is no longer specialized for RegExp. Use Object.valueOf.
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Escape sequences
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Octal escape sequences (\ followed by one, two, or three octal digits) are deprecated in string and regular expression literals.
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The escape and unescape functions are deprecated. Use encodeURI, encodeURIComponent, decodeURI or decodeURIComponent to encode and decode escape sequences for special characters.
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Appendix A. Reserved Words
Contents