使用awk过滤掉无法识别的字段

Question

我有一个CVS文件,我希望有一些值,如Y或N.人们正在添加评论或任意条目,例如NA?我要删除的条目:

Create,20055776,Y,,Y,Y,,Y,,NA?,,Y,,Y,Y,,Y,,,Y,,Y,,,Y,,,,,,,,
Create,20055777,,,,Y,Y,,Y,,,,Y,,Y,Y,,Y,,,Y,,Y,,,Y,,,,,,,,
Create,20055779,,Y,,,,,,,,Y,,,NA ?,,,Y,,,,,,TBD,,,,,,,,,

我可以gsub用来删除我期待的东西,例如:

$ cat test.csv | awk '{gsub("NA\\?", ""); gsub("NA \\?",""); gsub("TBD", ""); print}'
Create,20055776,Y,,Y,Y,,Y,,,,Y,,Y,Y,,Y,,,Y,,Y,,,Y,,,,,,,
Create,20055777,,,,Y,Y,,Y,,,,Y,,Y,Y,,Y,,,Y,,Y,,,Y,,,,,,,,
Create,20055779,,Y,,,,,,,,Y,,,,,,Y,,,,,,,,,,,,,,,

然而,如果有人添加新评论,那将会破裂.我正在寻找一个正则表达式来将比赛概括为"不是Y".

我尝试了一些消极的外观,但无法让它在我拥有的awk上工作GNU Awk 4.2.1, API: 2.0 (GNU MPFR 4.0.1, GNU MP 6.1.2).提前致谢!

Answer 1

awk 'BEGIN{FS=OFS=","}{for (i=3;i<=NF;i++) if ($i !~ /^(y|Y|n|N)$/) $i="";print}' test.CSV
Create,20055776,Y,,Y,Y,,Y,,,,Y,,Y,Y,,Y,,,Y,,Y,,,Y,,,,,,,,
Create,20055777,,,,Y,Y,,Y,,,,Y,,Y,Y,,Y,,,Y,,Y,,,Y,,,,,,,,
Create,20055779,,Y,,,,,,,,Y,,,,,,Y,,,,,,,,,,,,,,,

仅接受Y/N(不区分大小写).