Exploring formating a string

Dim mypatern$
Dim myarray As Variant
mypatern = String(n, "#") & "|"
theformat = ""
For i = 1 To Len(mystring) / n
theformat = theformat & mypatern
Next
mystring = Format(mystring, theformat)
MsgBox Format(mystring, theformat)
myarray = Split(mystring, "|")[VB]


why does
[VB]format (mystring, "## ##") work

but not

myformat = "## ##"
format (mystring, myformat)

Ok got it !!!

shouldn't use # but @ !!!