Question

我使用这些函数来计算单词countw，并使用单词scan来分析完整的文件名。 （对于那些感兴趣的人，我通常使用FILENAME docDir PIPE "dir ""&docRoot"" /B/S";）

使用传统的SAS，这适用于UNIX和Windows：

data OLD_SCHOOL;
    format logic withSlash withBack secondSlash secondBack $20.;

    logic = 'OLD_SCHOOL';

    withSlash = 'Delimited/With/Slash';
    wordsSlash = countw(withSlash, '/');
    secondSlash = scan(withSlash, 2, '/');

    withBack = 'Delimited\With\Back';
    wordsBack = countw(withBack, '\');
    secondBack = scan(withBack, 2, '\');

    worksTheSame = wordsSlash eq wordsBack and secondSlash eq secondBack;

    put _all_;
run;

结果

    withSlash=Delimited/With/Slash secondSlash=With wordsSlash=3
    withBack=Delimited\With\Back   secondBack=With  wordsBack=3 
    worksTheSame=1

使用较新的DS2语法，scan和countw处理反斜杠的方式不同

proc ds2;
data DS2_SCHOOL / overwrite=yes;
    dcl double wordsSlash wordsBack worksTheSame;
    dcl char(20)logic withSlash withBack secondSlash secondBack;
    method init();
        logic = 'DB2_SCHOOL';

        withSlash = 'Delimited/With/Slash';
        wordsSlash = countw(withSlash, '/');
        secondSlash = scan(withSlash, 2, '/');

        withBack = 'Delimited\With\Back';
        wordsBack = countw(withBack, '\');
        secondBack = scan(withBack, 2, '\');

        worksTheSame = (wordsSlash eq wordsBack) and (secondSlash eq secondBack);       
    end;
enddata;
run;
quit;

data BOTH_SCHOOLS;
    set OLD_SCHOOL DS2_SCHOOL;
run;

结果

    withSlash=Delimited/With/Slash secondSlash=With wordsSlash=3
    withBack=Delimited\With\Back   secondBack=      wordsBack=1 
    worksTheSame=0

这是否有充分的理由，或者我应该将其作为SAS的错误报告？

（正则表达式中可能存在反斜杠作用的链接。）

Answer 1

我在9.3中验证了这一点（缺少覆盖=是，作为旁注，令人讨厌）：

   "ports": [
   {
       "port":80,
       "targetPort": "8080",
       "name":"check-server"
   }

反斜杠确实似乎是一种逃避 - 即使在原始字符串中你需要一对它们。

从9.4 TS1M3开始不再是这种情况，因此不清楚9.3 TS1M2和9.4 TS1M3之间的位置是如何更改和/或修复的 - 并且在任何更改日志中都没有提及，不幸的是。

根据评论/验证，它看起来特别是在9.4 TS1M2中被更改/修复。

Answer 2

谢谢乔。为了进一步证明你做对了：如果我在旧的学校数据步骤中指定我的字符串：

Data FROM_OLD_SCHOOL;
    delimiter = '/';
    fullName = 'Delimited/With/Slash';
    output;

    delimiter = '\';
    fullName = 'Delimited\With\Back';
    output;
run;

我可以在DS2数据步骤中完美地使用它们：

proc ds2;
data DS2_SCHOOL / overwrite=yes;
    dcl double partsPresent;
    dcl char(20) secondPart;
    method run();
        set FROM_OLD_SCHOOL;

        partsPresent = countw(fullName, delimiter);
        secondPart = scan(fullName, 2, delimiter);
    end;
enddata;
run;
quit;

结果

Obs partsPresent secondPart delimiter fullName 
1   3            With       /         Delimited/With/Slash 
2   3            With       \         Delimited\With\Back

为什么DS2中的扫描处理与旧式SAS不同的反斜杠？

2 个答案: