$1...$9 Properties
Returns the nine most-recently memorized portions found during pattern matching. Read-only.
RegExp.$n
Arguments
RegExp
Required. The global RegExp object.n
Required. Any integer from 1 through 9.
Remarks
The value of the $1...$9 properties is modified whenever a successful parenthesized match is made. Any number of parenthesized substrings may be specified in a regular expression pattern, but only the nine most recent can be stored.
Note
The properties of the RegExp object are not available when a program is running in fast mode, the default for JScript. To compile a program that uses these properties from a command prompt, you must turn off the fast option by using /fast-. It is not safe to turn off the fast option in ASP.NET because of threading issues.
Example
The following example illustrates the use of the $1...$9 properties:
var newline = "\n"
var re = new RegExp("d(b+)(d)","ig");
var str = "cdbBdbsbdbdz";
var arr = re.exec(str);
var s = "";
s += "$1 contains: " + RegExp.$1;
s += newline;
s += "$2 contains: " + RegExp.$2;
s += newline;
s += "$3 contains: " + RegExp.$3;
The output of this program is as follows.
$1 contains: bB
$2 contains: d
$3 contains: