data _null_;
length x y $8;
do x = "", "A", "XDANO", "XXQRX", "XMKR";
y = prxchange("s|^X+||",1,x);
put x= @10 y=;
end;
run;
/* on log
x= y=
x=A y=A
x=XDANO y=DANO
x=XXQRX y=QRX
x=XMKR y=MKR
*/
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