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RegExp.$n

syntax:

RegExp.$n

description:

The text matched by the nth group, that is, the nth sub pattern in parenthesis. The numbering corresponds to \n, back references in patterns, and $n, substitutions in replacement patterns.

 

Read-only property.

 

see:

Regular expression reference characters, regular expression replacement characters

 

example:

var str = "one two three two one";

var pat = /(t.o)\s/

str.match(pat)

   // RegExp.$1 == "two"

 


RegExp.input