请教大虾一个复杂的数据处理的问题

shiyiming

比如，有一个测试数据集如下：
data test;
input x $1-50;
cards;
ip?hone
home！
;

由于ip?phone其实是iphone,所以第一个观测想返回iphone,而第二个则不需要！，最后想得到：
iphone
home

如何处理？多谢大侠指教！

shiyiming

[code:22zbd3xt]

data test1;
set test;
Y=compress(x,'?');
run;

[/code:22zbd3xt];

shiyiming

[code:33jrs1io]
data test1;
set test;
Y=compress(x,,"kn");
run;

[/code:33jrs1io]

shiyiming

[quote="zhangzachary":1rlyw850][code:1rlyw850]
data test1;
set test;
Y=compress(x,,"kn");
run;

[/code:1rlyw850][/quote:1rlyw850]
厉害！怎么要两个逗号呢？