我如何得到一个字符的位置从批次字符串 [英] How I get the position of a character from a string in batch

问题描述

我保存在一个结果字符串变量 RES ，这样的结果是一样的东西 2.3 / 5.0 我会像 / ，并通过 ECHO发送到批量输出命令之前得到的部分。我一直在寻找我怎么可以这样使用批处理命令，但只获得使子到一个固定位置的结果，但我怎么能知道这个职位？
如果我想知道的位置也许我应该做的唯一的事情是：

I have a result string saved in a variable RES, this result is something like 2.3/5.0 I would like to get the part before the "/" and sending it to the batch output through an ECHO command. I have been searching how can I do this using batch commands, but only getting results of making substring to a fixed position, but how can I know this position? If i would knew the position the only thing I should probably do is:

ECHO %RES:~0,pos%

接下来的问题是：我如何才能从字符串这个位置？谢谢

Then the question is: how I get this position from the string? Thanks

推荐答案

如果你真的想要自己的位置，你可以申请从strlen函数<一个href=\"http://stackoverflow.com/questions/5837418/how-do-you-get-the-string-length-in-a-batch-file\">How你得到的字符串长度在批处理文件下面的结果，但如果你只是想那个preFIX，你可以简单地做：

If you really want the position itself, you can apply the strlen function from How do you get the string length in a batch file? to the result below, but if you just want that prefix, you can simply do:

set "res=2.3/5.0"
for /f "tokens=1 delims=/" %%i in ("%res%") do (set prefix=%%i)

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