Well I'm just trying to say that

$Rocpath='server\share\'
If Exist (\\)+$Rocpath

Should return the same value as

$Rocpath='\\server\share\'
If Exist $Rocpath

Both of the examples above should return the same values.

The only reason for using a "variable" $Rocpath in the first place is if you are going to be using it a lot more times later on. If you're not going to be using it over and over then just do the check without a variable.

If Exixt('\\server\share\')
 do something
Else
 log or quit
EndIf


Bottom line, did you get it working?