regular expression g equivalent in unityscript?

How do you do a regular expression in unity3d that will replace all the instances.

in javascript this would be done using g

re=/hello/g; mystring="hello my baby hello my honey"; result=mystring.replace(re,"goodbye");

I know in Unity3d it would be something like this

myresult=Regex.Replace(mystring,"hello","goodbye"); but where do you put the g?

Thanks,

Dan