Masking character

[Joe]

Hi,

How to mask off the character that i do not want and
retain certain characters? example

original: F1234j

change one: F1xxxj

where F,1 and j is retained.


many thanks.

regards,
Joe

 

[Tom Ogilvy]

s = "F1234j"
s = left(s,2) & right(s,1)