找出一个环境变量是否包含一个子 [英] Find out whether an environment variable contains a substring

问题描述

我需要找出是否有一定的环境变量（假设美孚）包含的子串（比方说BAR）在Windows批处理文件。有没有办法做到这一点只使用默认安装，Windows批处理文件命令和/或程序/命令？

I need to find out if a certain environment variable (let's say Foo) contains a substring (let's say BAR) in a windows batch file. Is there any way to do this using only batch file commands and/or programs/commands installed by default with windows?

例如：

set Foo=Some string;something BAR something;blah

if "BAR" in %Foo% goto FoundIt     <- What should this line be? 

echo Did not find BAR.
exit 1

:FoundIt
echo Found BAR!
exit 0

我应该标记线之上是让这个简单的批处理文件打印找到BAR？

What should the marked line above be to make this simple batch file print "Found BAR"?

推荐答案

当然，只要使用好老FINDSTR：

Of course, just use good old findstr:

echo.%Foo%|findstr /C:"BAR" >nul 2>&1 && echo Found || echo Not found.

而不是回声 ING你也可以在其他地方分支，但我想，如果你需要根据多个语句，下面是简单：

Instead of echoing you can also branch elsewhere there, but I think if you need multiple statements based on that the following is easier:

echo.%Foo%|findstr /C:"BAR" >nul 2>&1
if not errorlevel 1 (
   echo Found
) else (
    echo Not found.
)

编辑：记的<一个href=\"http://stackoverflow.com/questions/5491383/find-out-whether-an-environment-variable-contains-a-substring/5492033#5492033\">jeb's解决方案以及哪个更简洁，但它需要额外的精神一步找出它做什么阅读时。

Take note of jeb's solution as well which is more succinct, although it needs an additional mental step to figure out what it does when reading.

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