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

There isn't much you can do but I highly recommend you avoid using eval. You can extend the RegExp prototype to help you out.

RegExp.prototype.flags = function () {
    return (this.ignoreCase ? "i" : "")
        + (this.multiline ? "m" : "")
        + (this.global ? "g" : "");
};

var reg1 = /AAA/i;
var reg2 = new RegExp(reg1.source, reg1.flags() + 'g');