Extendscript Generating unique name with increment (for AE)

newUniqueName.jsx

function newUniqueName( newName, stringList ){  
    //detect digits
    var reg = "( *)(\\d+)([.,]?\\d*)$";
    //clean input
    var regexClean = new RegExp(reg);
    newName= newName.replace(regexClean,""); 
    //go!
    var regex = new RegExp( newName + reg);
    //The greatest number found
    var greatestNumber = 0;
    //The number of digits for the number as string
    var numDigits = 0; 
    var spaceString = "";
    for ( var i =0 ; i < stringList.length ; i ++)
    {
        var currentNumberMatch = stringList[i].match(regex);
        if (stringList[i] === newName && greatestNumber == 0) greatestNumber++;  
        else if (currentNumberMatch !== null)
        {
            //if its a decimal number, keep only the integer part
            var numberAsString = currentNumberMatch[2];
            //convert to int
            var numberAsInt = parseInt(currentNumberMatch[2],10);
            if(numberAsInt >= greatestNumber ){
                greatestNumber = numberAsInt  + 1;
                spaceString = currentNumberMatch[1];
            }
            //check if there are zeroes before the number, count the digits
            if(numberAsInt.toString().length < numberAsString.length && numDigits < numberAsString.length) numDigits = numberAsString.length;            
        }
    }

    //add leading 0 if needed
    if (greatestNumber > 0)
    {
            //convert to string with leading zeroes
            if (greatestNumber == 1) {
                greatestNumber++;
                spaceString = " ";  
            }
            newName += spaceString;
            greatestNumber = addZeroes(greatestNumber,numDigits);
            newName += greatestNumber;
    }

    return newName;
}

function addZeroes(num, numDigits, base)
{
	if (base == undefined) base = 10;
	var result = num.toString(base);
    while(numDigits > result .length)
    {
        result  = "0"+ result ;
    }
    return result;
}


function newUniqueEffectName (newName ,layer){
    var nbFx = layer.effect.numProperties;
    var nameFx = [];
    for( var i = 0 ; i < nbFx ; i++){
        nameFx.push(layer.effect(i+1).name); 
    }
    return newUniqueName(newName, nameFx)
}