Using wildcard to reduce code

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Using a wildcard (:) in the variable lists would reduce the code to a great extent.
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Colon can be used as a wildcard in variable lists. In the example given below, (keep=v:) keeps all variable names that begins with letter v.
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data x(keep=v:) ;
v1=1 ;
v2=10 ;
v3=100 ;
v4=1000 ;
v5=10000 ;
w1=1;
w2=10;
run;

More: http://support.sas.com/publishing/pubcat/chaps/55513.pdf
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