批处理文件:如何替换“="(等号)和一个字符串变量? [英] Batch file: How to replace "=" (equal signs) and a string variable?

问题描述

除了SED，等号怎么替换?以及如何在字符串替换中使用字符串变量?

Besides SED, how can an equal sign be replaced? And how can I use a string variable in string replacement?

考虑这个例子:

For /F "tokens=*" %%B IN (test.txt) DO (
   SETLOCAL ENABLEDELAYEDEXPANSION
   SET t=is
   SET old=%%B
   SET new=!old:t=!
   ECHO !new!

   ENDLOCAL
)

:: SET new=!old:==!

两个问题:

首先，我不能在 !:=! 中使用变量 %t%.

First, I cannot use the variable %t% in !:=!.

   SET t=is
   SET old=%%B
   SET new=!old:t=!

其次，我无法替换命令行中的等号

Second, I cannot replace the equal sign in the command line

   SET new=!old:==!

推荐答案

我刚刚为此自己创建了一个简单的解决方案，也许对某人有帮助.

I just created a simple solution for this myself, maybe it helps someone.

缺点(或优点，取决于您想做什么)是多个等号一个接一个地处理，就像一个等号一样.(例如:str==ing"给出与str=ing"相同的输出)

The disadvantage (or advantage, depends on what you want to do) is that multiple equal signs one after another get handled like one single equal sign. (example: "str==ing" gives the same output as "str=ing")

@echo off
set "x=this is=an test="
echo x=%x%

call :replaceEqualSign in x with _
echo x=%x%

pause&exit


:replaceEqualSign in <variable> with <newString>
    setlocal enableDelayedExpansion

        set "_s=!%~2!#"
        set "_r="

        :_replaceEqualSign
            for /F "tokens=1* delims==" %%A in ("%_s%") do (
                if not defined _r ( set "_r=%%A" ) else ( set "_r=%_r%%~4%%A" )
                set "_s=%%B"
            )
        if defined _s goto _replaceEqualSign

    endlocal&set "%~2=%_r:~0,-1%"
exit /B

如您所见，您可以像这样使用函数:

As you have seen, you use the function like this:

call :replaceEqualSign in variableName with newString

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