var arg;
arg[0] = argument0 // substring to find
arg[1] = argument1 // find on which string

var text, pre_text, count;
text=""
pre_text=""
count=0

if arg[0] == "" then return 0

while(text!=pre_text){
  pre_text=text
  text=string_replace(arg[1],arg[0],"")
  count+=(text!=pre_text)
}

return count