属性:
$1, ..., $9 Parenthesized substring matches, if any.
$_ See input.
$* See multiline.
$& See lastMatch.
$+ See lastParen.
$` See leftContext.
$' See rightContext.
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.
input The string against which a regular expression is matched.
lastIndex The index at which to start the next match.
lastMatch The last matched characters.
lastParen The last parenthesized substring match, if any.
leftContext The substring preceding the most recent match.
multiline Whether or not to search in strings across multiple lines.
rightContext The substring following the most recent match.
source The text of the pattern.
方法:
compile Compiles a regular expression object.
exec Executes a search for a match in its string parameter.
test Tests for a match in its string parameter
javaScript内置7.RegExp
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