replace numbers with X

[Guest]

I'm relatively new to Excel I'm wondering if there is a formula i can use
that replaces the last four numbers in a sequence with "X" no matter the
length of the sequence eg:

149876 14xxxx
1234789 123xxxx

This is not like the social security number where the amount of numbers is
fixed they are varying lengths. Thank you

 

[daddylonglegs]

one way would be

=REPLACE(A1,LEN(A1)-3,4,"xxxx"

 

[Guest]

=left(trim(a1),len(a1)-4)&"xxxx"

 

[Guest]

Apologies I need it to replace the first four digits with X
eg Account number = 123456 outcome I require is XXXX56

 

[daddylonglegs]

Try

=REPLACE(A1,1,4,"xxxx"

 

[George]

Just alter daddylonglegs formula

From =REPLACE(A1,LEN(A1)-3,4,"xxxx") Last 4
To =REPLACE(A1,1,4,"xxxx") First 4

George