Mask the numbers

[BrahmanandaRao]

data aadhar ;
input aadhar $ 28.;
datalines ;
1727-8514-4648
;
run;


data mask;
set aadhar;
new=substr(aadhar,length(aadhar)-1,9)='xxxx';
run;

I want to mask the first 8 numbers 

required output

xxxx-xxxx-4648

[Kurt_Bremser]

Will all values have the format of <4 digits><hyphen><4 digits><hyphen><4 digits>?

[Ksharp · Accepted solution]

data aadhar ;
input aadhar $ 28.;
datalines ;
1727-8514-4648
;
run;


data mask;
set aadhar;
new=prxchange('s/\d+/xxxx/',2,aadhar);
run;

[BrahmanandaRao]

Hi 

Sharp

Thank you for your solution  I am not good at regular expressions 

[Ksharp]

Then check documentation and learn it . It is a must-have skill for sas programmer .