Changing the RegExp flags

Question

So basically I wrote myself this function so as to be able to count the number of occurances of a Substring in a String:

String.prototype.numberOf = function         


        

Answer 1

var globalRegex = new RegExp(needle.source, "g");

Live Demo EDIT: The m was only for the sake of demonstrating that you can set multiple modifiers

var regex = /find/;
var other = new RegExp(regex.source, "gm");
alert(other.global);
alert(other.multiline);