JavaScript 2.0-The Complete Reference, Second ... - freecodingtutorial

Table 8-7: Static Properties of the RegExp Class Object
Property Alternat
e Form
Value Example
may be better
to use the
length of the
regexp
pattern and
the lastIndex
property to
calculate
this value.
>input >$_ >String
containing the
default string
to match
against the
pattern.
>lastIndex >None >Integer
specifying the
position in the
string at which
to start the
next match.
Same as the
instance
property,
which should
be used
instead.
>lastMatch >$&
>String
containing
the most
recently
matched text.
>lastParen >$+ >String
containing
the text of the
last
parenthesized
subexpressio
n of the most
recent match.
>leftContext >$` >String
containing the
text to the left
>var pattern = /(cat) (dog)/g;
pattern.test("this is a
cat dog and cat dog");
document.writeln RegExp.input);
// prints "this is a cat dog and
cat dog"
document.writeln(RegExp['$_ ']);
>var pattern = /(cat) (dog)/g;
pattern.test("this is a
cat dog and cat dog");
document.writeln(RegExp.lastIndex);
// prints 17
>var pattern = /(cat) (dog)/g;
pattern.test("this is a
cat dog and cat dog");
document.writeln
(RegExp.lastMatch);
// prints "cat dog"
document.writeln
(RegExp['$&']);
// prints "cat dog"
>var pattern = /(cat) (dog)/g;
pattern.test("this is a
cat dog and cat dog");
document.writeln
(RegExp.lastParen);
// prints dog
document.writeln(RegExp['$+ ']);
// prints "dog"
>var pattern = /(cat) (dog)/g;
pattern.test("this is a
cat dog and cat dog");