Javascript String.replace with dynamic regular expressions?

Question

I have the following code, which works, but I need to inject some different stuff into the regular expression object (regex2) at runtime. However, text.replace

Answer 1

var value = "2012-09-10";
value = value.replace(/([0-9]{4})[\/-]([0-9]{2})[\/-]([0-9]{2})/,"$3/$2/$1");
alert(value);

this will show

10/09/2012