Override Internet Explorer implementation of String.split

split.js

/*
 * String.split(delimiter,limit)
 * Override Internet Explorer implementation of String.split to handle regular
 * expression capture groups in the same manner as all other browsers.  Each
 * capture group in the matched text will be included in the split array.
 */
if("a'b".split(/(')/g).length==2){
    String.prototype.split = function(delimiter/*,limit*/){
        if(typeof(delimiter)=="undefined"){
            return [this];
        }
        var limit = arguments.length>1?arguments[1]:-1;
        var result = [];
        if(delimiter.constructor==RegExp){
            delimiter.global = true;
            var regexpResult,str=this,previousIndex = 0;
            while(regexpResult = delimiter.exec(str)){
                result.push(str.substring(previousIndex,regexpResult.index))
                for (var captureGroup=1,ct=regexpResult.length;captureGroup<ct;captureGroup++){
                    result.push(regexpResult[captureGroup]);
                }
                str=str.substring(delimiter.lastIndex,str.length);
            }
            result.push(str);
        }else{
            var searchIndex=0,foundIndex=0,len=this.length,dlen=delimiter.length;
            while(foundIndex!=-1){
                foundIndex = this.indexOf(delimiter,searchIndex);
                if(foundIndex!=-1){
                    result.push(this.substring(searchIndex,foundIndex))
                    searchIndex = foundIndex+dlen;
                }else{
                    result.push(this.substring(searchIndex,len));
                }
            }
        }
        if(arguments.length>1&&result.length>limit){
            result = result.slice(0,limit);
        }
        return result;
    }
}