Question

我到处搜索过这个并没有找到它，所以我想做的很简单，我想在文件名中计算下划线并将其放在一个变量中以便以后使用它。

是否有任何简单的批处理代码可以执行此操作？

Answer 1

@echo off
setlocal enabledelayedexpansion

set filename=__example_file.bin_
set cnt=0
set pos=0

:loop
if "!filename:~%pos%,1!"=="_" set /a cnt=%cnt%+1
set /a pos=%pos%+1
if not "!filename:~%pos%,1!"=="" goto loop

echo Count: %cnt%

这段代码非常难看，但到目前为止我找不到更好的方法。

Answer 2

计算下划线的不同方法（或由下划线分隔的更精确的元素）
是使用self expanding code：

:: Q:\Test\2017\08\28\SO_45917406.cmd
@echo off & setlocal enabledelayedexpansion

set "FileName=example_file_name_20170828_181000.txt"
Set i=1&Set "FileName[!i!]=%FileName:_="&Set /a i+=1&Set "FileName[!i!]=%"

Echo Counted %i% underscore separated elements
Set FileName

示例输出：

> Q:\Test\2017\08\28\SO_45917406.cmd
Counted 5 underscore separated elements 
FileName=example_file_name_20170828_181000.txt
FileName[1]=example
FileName[2]=file
FileName[3]=name
FileName[4]=20170828
FileName[5]=181000.txt

Answer 3

此解决方案的灵感来自@xmcp：

@echo off
Rem The srting to count in the filename is the underscrore "_"
Rem we can of course set another one ;) 
set "MyString=_"
setlocal enabledelayedexpansion
@for /f "delims=" %%a in ('Dir /b "%userprofile%\Desktop"') do (
   set "filename=%%a"
   set /a "cnt=0"
   set /a "pos=0"
   Call:Counting_String "!filename!" "%Mystring%"
)
pause & exit
::*********************************************************
:Counting_String <filename> <MyString>
set "filename=%~1"
set "string=%~2"
if /I "!filename:~%pos%,1!"=="%Mystring%" set /a cnt+=1
set /a pos+=1
if not "!filename:~%pos%,1!"=="" goto Counting_String
echo !filename!: [!cnt!] "%Mystring%"
exit /b
::*********************************************************

使用bat计算Filename中的下划线

3 个答案: