In Expert view we can use the VB keyword for scripting like 
Function:
1.Mid  Returns a specified number of characters from a 
string.
2.Strcom Returns a value indicating the result of a string 
comparison. 
3.Instr Returns the position of the first occurrence of one 
string within another.
4.Isdate Returns a Boolean value indicating whether an 
expression can be converted to a date.

so many functions are there that you can use in the expert 
view.