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Asked: 2019-12-26 11:36:21 +0800 CST

命令行：获取 2 个不同分隔符之间的子字符串

  • 772

我如何能够在两个不同的定界符之间获得一个子字符串，这两个定界符也位于给定字符串中的可变位置。

例如：

String1 = "my first example {{my first substring}}"
String2 = "my great second example which has much more words included before {{my second substring}} and after the substring"
Substring1 = "my first substring"
Substring2 = "my second substring"

如您所见，子字符串之前的分隔符是“{{”，之后的分隔符是“}}”。

我发现的关于子字符串操作的所有内容都是严格的位置设置，在这里没有帮助。

提前致谢！

command-line batch-file

3 个回答

  1. @echo off
cls
setlocal ENABLEDELAYEDEXPANSION

set String1=my first example {{my first substring}}
set String2=my great second example which has much more words included before {{my second substring}} and after the substring

call :extract %String1% 
echo %Substring%
call :extract %String2% 
echo %Substring%

endlocal
goto :EOF

:extract
for /f "delims={ tokens=2" %%x in ("%*") do (
    set Substring=%%x
)
for /f "delims=}" %%x in ("%Substring%") do (
    set Substring=%%x
)
exit /b

    我不相信这会给出正确的结果。例如 --- {{abc {123} xyz}} --- 产生 abc 但我认为正确的结果是 abc {123} xyz。– 德本汉姆

    这是正确的。为了解决这个问题，我们必须有一些源字符串中不存在的可打印字符（至少在最终定界符之前）。

    例如，如果这样的 char 是@代码可能是

    @echo off
cls
setlocal ENABLEDELAYEDEXPANSION

set String1=my first example {{my first substring}}
set String2=my great second example which has much more words included before {{my second substring}} and after the substring
set String3=--- {{abc {123} xyz}} ---

call :extract %String1% 
echo %Substring%
call :extract %String2% 
echo %Substring%
call :extract %String3% 
echo %Substring%

endlocal
goto :EOF

:extract
set tempstr=%*
set tempstr=%tempstr:{{=@%
set tempstr=%tempstr:}}=@%
for /f "delims=@ tokens=2" %%x in ("%tempstr%") do (
    set Substring=%%x
)
exit /b
    • 1

  2. 我想我找到了解决方案：

    set string="my great second example which has much more words included before {{my second substring}} and after the substring"
echo string: %string%
set "tmp=%string:{=" & set "tmp=%"
echo tmp:    %tmp%
for /f "delims=}" %%a in ("%tmp%") do set substr=%%a
echo substr: %substr%

    结果：

    string: "my great second example which has much more words included before {{my second substring}} and after the substring"
tmp:    "my great second example which has much more words included before "
substr: my second substring

    它有效，但我不太明白它如何能够确定 tmp-string 的子字符串，因为它不在其内容中。

    • 0
  3. Best Answer

    我假设您只需要每个字符串中的一个子字符串。这是一个强大的解决方案，它可以处理任何值，但它不能在值中处理，如果!在值中，也会^被剥离!。

    @echo off
setlocal enableDelayedExpansion
for %%S in (
  "my {{first substring}} example"
  "my {ignore {{second substring}} example"
  "my {{third {sub}string}} example"
  "poison character {{&|<>^^ "^&^|^<^>^^^^"}} example"
  "empty {{}} example"
  "my {first error}} example"
  "my {{second error} example"
  "my third error example{{"
  ""
  "Limitation: {{eclamation is stripped^^^!}}"
  "Limitation: {{caret ^^^^ is stripped if exclamation present^^^!}}"
) do (
  set "string=%%~S"
  echo(!string!
  call :get{{sub}} string sub && echo(!sub! || echo ERROR: substring not found
  echo(
)
exit /b

:get{{sub}}  inStrVar  subStrVar
setlocal enableDelayedExpansion
set "str=!%~1!"
if not defined str exit /b 1
set "sub1=!str:*{{=!"
if not defined sub1 exit /b 1
if "!sub1!"=="!str!" exit /b 1
set "sub="
for %%N in (^"^

^") do for /f "delims=" %%A in ("x!sub1:}}=%%~N!") do if not defined sub set "sub=%%A"
set "sub=!sub:~1!"
if "!sub!"=="!sub1!" exit /b 1
for /f delims^=^ eol^= %%A in (""!sub!"") do endlocal & set "%~2=%%~A" & exit /b 0

    - 输出 - 

    my {{first substring}} example
first substring 

my {ignore {{second substring}} example
second substring 

my {{third {sub}string}} example
third {sub}string 

poison character {{&|<>^ "&|<>^"}} example
&|<>^ "&|<>^" 

empty {{}} example


my {first error}} example
ERROR: substring not found

my {{second error} example
ERROR: substring not found

my third error example{{
ERROR: substring not found


ERROR: substring not found

Limitation: {{eclamation is stripped!}}
eclamation is stripped 

Limitation: {{caret ^ is stripped if exclamation present!}}
caret  is stripped if exclamation present

    获取子字符串有两个主要技巧。

    • !str:*{{!通过第一次出现 . 删除所有内容{{。
    • for %%N in ...在 in 创建一个带引号的换行符，%%N以便!sub:{{=%%~N!用换行符替换 all }}。内部for /f然后分别迭代每个字符串，do循环只保留第一个结果。x以防万一子字符串为空。
    • 0

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