Expression syntax for fields in the rdlc file

For my one of my fields in the rdlc file I trying to figure the correct syntax to for for of my fields
Im trying to write to only display values that begin with 1-D for the expression
 
for example
im trying to say something like
display Field!Code.Value who left position does not begin with 'E', How to write this logic.
=First(Fields!Etag.Value <> 'E') but this is the wrong syntax, what is the correct syntax