AWK难倒的：一个领域内的正则表达式替换 [英] awk stumper: regex substitution within a field

问题描述

我是新来的awk，我似乎无法推测这一个。我怎样才能在一个字段中使用常规的前pression替代？

I'm new to awk, and I can't seem to figure this one out. How can I substitute in a single field using a regular expression?

在Perl中，我所感兴趣的领域分配给一个变​​量，那么 $ MYVAR =〜S /富/酒吧/ G 。当然也可以在Perl我要做我自己的田间管理，这是在awk中更容易。

In perl, I could assign the field of interest to a variable, then $myvar =~ s/foo/bar/g. Of course also in perl I have to do my own field management, and that's easier in awk.

有关手头刚才的问题，这是欧洲货币的记录和我想改变逗号的金额场周期。但我只需要瞄准这一领域，所以我不裂伤，其中逗号可以作为散文标点符号等领域。

For the issue at hand just now, it's European money records and I want to change commas to periods in the amount field. But I need to target only that field, so I don't mangle the other fields where commas could be used as prose punctuation.

是解决方案，比我想象的更困难？或者更简单呢？我一定要改变记录器或类似的东西俗气？

Is the solution more difficult than I imagine? Or simpler? Do I have to change the record separator or something tacky like that?

感谢您的帮助！

推荐答案

子（）接受第三个参数，它是字段（或变量）来改变：

sub() accepts a third argument which is the field (or variable) to change:

$ echo '02/08/2011 7,33 Shopping' | awk '{sub(/,/,".",$2)} 1'
02/08/2011 7.33 Shopping

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