|SAS(r) Software Tips|
|The situation arises often. You have a number of variables that all start with the same prefix and you wish to drop or keep them.
A good example is PROC TRANSPOSE output. Often you may use the PREFIX option for convenience, then carry out some processing in a datastep. Frequently the variables output from TRANSPOSE are then of no interest.
To do this, use the drop or keep statement as follows::
drop _: ; keep _: ;
The : is a wildcard that causes any variable name starting with the prefix (in this case underscore) to be dropped or kept.