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JS RegExp object attributes lastIndex, lastMatch, lastParen, lastContext, rightContext attribute explanation of js regular expression

JS RegExp object attributes lastIndex, lastMatch, lastParen, lastContext, rightContext attribute explanation of js regular expression

Updated: October 12, 2012 11:46:19 Author:
Explanation of the js regular expression RegExp object attributes lastIndex, lastMatch($&), lastParen($+), lastContext, rightContext attributes

Properties, return the last index position of the matching content, that is, the start position of the next match. Note that the string index starts from 0.
Code:


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($&) attribute, read-only attribute, if there is no matching information, the value of this attribute is an empty string

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Properties Read-only static property, which returns the value of the last submatch obtained in the last match detection, and returns an empty string if there is no submatch

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Properties Returns the character information on the left side of the matching content. The initial value of the attribute is an empty string. If there is a corresponding value matching the attribute, it will change.

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Properties Returns the character information on the right side of the matching content, read-only static attributes The initial value is an empty string. If there is a match, it returns the information on the right side of the matching content.

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  • lastIndex
  • lastMatch
  • lastParen
  • lastContext
  • rightContext

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