为什么不使用多个文字搜索字符串FINDSTR这个例子找到一个匹配？ [英] Why doesn't this FINDSTR example with multiple literal search strings find a match?

问题描述

下面的例子FINDSTR未能找到匹配。

The following FINDSTR example fails to find a match.

echo ffffaaa|findstr /l "ffffaaa faffaffddd"

为什么？

推荐答案

Apparantly这是一个长期FINDSTR错误。我觉得这可能是一个沉重的bug，视情况而定。

Apparantly this is a long standing FINDSTR bug. I think it can be a crippling bug, depending on the circumstances.

我已确认在两个不同的Vista计算机，Windows 7的机器，和XP的机器的命令失败。
我发现这个 FINDSTR - 破???一个报告链接Windows Server 2003上类似的搜索失败，但成功在Windows 2000上。

I have confirmed the command fails on two different Vista machines, a Windows 7 machine, and an XP machine. I found this findstr - broken ??? link that reports a similar search fails on Windows Server 2003, but it succeeds on Windows 2000.

我已经做了一些实验，似乎所有的下列条件必须满足一个失败的可能性：

I've done a number of experiments and it seems all of the following conditions must be met for the potential of a failure:

• 搜索是使用多个文字搜索字符串


• 的搜索字符串的长度不同


• 短搜索字符串有一个较长的搜索字符串
重叠一定量

• 搜索是大小写敏感的（没有 / I 选项）

• The search is using multiple literal search strings
• The search strings are of different lengths
• A short search string has some amount of overlap with a longer search string
• The search is case sensitive (no /I option)

在每次我都看到失败，它始终是失败的较短的搜索字符串之一

In every failure I have seen, it is always one of the shorter search strings that fails.

不要紧，如何指定的搜索字符串。 搜索选项，同时用 / G：文件选项相同的故障结果使用多个 / C ++实现

It does not matter how the search strings are specified. The same faulty result is achieved using multiple /C:"search" options and also with the /G:file option.

唯一的解决方法3，我已经能够拿出有：

The only 3 workarounds I have been able to come up with are:

• 使用 / I 如果你不关心的情况下的选择。显然，这可能不符合你的需求。

• Use the /I option if you don't care about case. Obviously this might not meet your needs.

使用 / R 常规EX pression选项。但是，如果你这样做，那么你必须确保你逃避搜索的元字符，使其预期文字的搜索结果相匹配。这可能是有问题的为好。

Use the /R regular expression option. But if you do then you have to make sure you escape any meta-characters in the search so that it matches the result expected of a literal search. This can be problematic as well.

如果您使用的是 / V 选项，然后使用多个管道FINDSTR一个搜索字符串，而不是每一个FINDSTR多个搜索命令。这也可以是一个问题，如果你有很多的搜索字符串的您要使用 / G：文件选项

If you are using the /V option, then use multiple piped FINDSTR commands with one search string each instead of one FINDSTR with multiple searches. This also can be a problem if you have a lot of search strings for which you want to use the /G:file option.

我恨这个错误!!!!

I hate this bug!!!!

注意的 - 请参阅什么是无证功能和限制在Windows FINDSTR命令？获得FINDSTR特质的COM prehensive列表。的

Note - See What are the undocumented features and limitations of the Windows FINDSTR command? for a comprehensive list of FINDSTR idiosyncrasies.

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