OR. If you want more power.
data have;
input a b & $100.;
cards;
1 current:abcdedfgh previous:xyzwabc current:pqr previous:klmnop
2 previous:dedfgh previous:wabc current:abcpqr current:abklmnop
;
run;
data want;
set have;
_b=prxchange('s/previous:\S+//i',-1,b);
run;
Ksharp
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