How to Ignore the unwanted data using If condition

Hi Experts,

i have a required to ignore the # and Error words in webi, my requirement is

i am have two fields -

First Name  and Last Name - some time first name or last name having the "#" and :error" ,

if anyone contain # or error then i need to display it as blank otherwise i need to add the first name and last name to display the complete name,

Need your guidance

Firstname  Lastname               Expected output

Balaji         Vivekanandan         Balaji Vivekanandan

Error           #                          Should be display as blank

Balaji          Error                     Balaji

Regards,

Balaji