bat批次處理之字串操作的實現

set testStr=abcdefghijklmnopqrstuvwxyz0123456789
echo 原始字串 %testStr%
echo 提取前五個字串：%testStr:~0,5%
echo 提取最後五個字串：%testStr:~-5%
echo 提取第一個到倒數第六個字串：%testStr:~0,-5%
echo 提取五個字串，從第四個字元開始:%testStr:~3,5%

echo 替換之前:%repStr%
echo 替換後：%repStr:aa=zz%
echo repStr=%repStr%
set "repStr=%aa:aa=zz%"
echo repStr=%repStr%

set aa=aabbcc
set bb=ddeeff
echo %aa%%bb%
echo aa=%aa%
echo bb=%bb%
set "aa=%aa%%bb%"
echo aa=%aa%

Setlocal ENABLEDELAYEDEXPANSION
::啟用命令擴充套件，參加setlocal /?命令
set str1=This is a test string
set ch1=t
::注意，這裡是區分大小寫的！
set str=%str1%
::複製字串，用來截短，而不影響源字串
:next
if not "%str%"=="" (
set /a num+=1
if "!str:~0,1!"=="%ch1%" goto last
::比較首字元是否為要求的字元，如果是則跳出迴圈
set "str=%str:~1%"
goto next
)
set /a num=0
::沒有找到字元時，將num置零
:last
echo 字元'%ch1%'在字串"%str1%"中的首次出現位置為%num%
echo 輸出完畢，按任意鍵退出&&pause>nul&&exit

echo off
echo 完全路徑：%0
echo 去掉引號：%~0
echo 所在分割區：%~d0
echo 所在路徑：%~p0
echo 檔名：%~n0
echo 拓展名:%~x0
echo 檔案屬性：%~a0
echo 修改時間:%~t0
echo 檔案大小:%~z0
echo %d0%
echo dp0 : %~dp0
echo sdp0:%~dp0
echo fo:%~f0
echo cd %cd%
rem set 目標字串=%源字串:~起始值,擷取長度%
set testStr=abcdefghijklmnopqrstuvwxyz0123456789
echo 原始字串 %testStr%
echo 提取前五個字串：%testStr:~0,5%
echo 提取最後五個字串：%testStr:~-5%
echo 提取第一個到倒數第六個字串：%testStr:~0,-5%
echo 提取五個字串，從第四個字元開始:%testStr:~3,5%
echo ================================================
echo ================    字串替換       ===========
echo ================================================
set repStr=aaabbbcccdddeeefff
echo 替換之前:%repStr%
echo 替換後：%repStr:aa=zz%
echo repStr=%repStr%
set "repStr=%aa:aa=zz%"
echo repStr=%repStr%
echo ================================================
echo ================    字串合併       ===========
echo ================================================
set aa=aabbcc
set bb=ddeeff
echo %aa%%bb%
echo aa=%aa%
echo bb=%bb%
set "aa=%aa%%bb%"
echo aa=%aa%

Setlocal ENABLEDELAYEDEXPANSION
::啟用命令擴充套件，參加setlocal /?命令
set str1=This is a test string
set ch1=t
::注意，這裡是區分大小寫的！
set str=%str1%
::複製字串，用來截短，而不影響源字串
:next
if not "%str%"=="" (
set /a num+=1
if "!str:~0,1!"=="%ch1%" goto last
::比較首字元是否為要求的字元，如果是則跳出迴圈
set "str=%str:~1%"
goto next
)
set /a num=0
::沒有找到字元時，將num置零
:last
echo 字元'%ch1%'在字串"%str1%"中的首次出現位置為%num%
echo 輸出完畢，按任意鍵退出&&pause>nul&&exit