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文件夹下有三个由字母、数字、汉字、特殊字符组成文件名的文件同时批处理自身也在其中：
一b!a!1235@_ s%#8i  三 c.rar
h^e12 0~%l%!p!@. s321-的文件.txt
%o%%% !O!ffi9~  ce$- Wor8d29 文档.docx
重命名.bat
图1：

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要求运行批处理将这三个文件文件名中的数字、汉字、特殊字符全部(含空格)去掉，而重命名为只含字母的文件，但
后缀名不能更改，同时批处理自身名字不能更改，重命名后：
basic.rar
helps.txt
oOfficeWor.docx
重命名.bat
图2：

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要求：代码简洁、通用、效率不至于太低。
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@echo off
for %%a in (*.*) do (
    if "%%~nxa" neq "%~nx0" (
        set "name=%%~na"
        setlocal enabledelayedexpansion
        set name1=!name!
        call :lp
        ren "!name!%%~xa" "!nam!%%~xa"
        set "nam="
        endlocal
)
)
pause
:lp
if defined name1 (
set "var=!name1:~,1!"
if "!var!" leq "Z" (
if "!var!" geq "a" (
set "nam=!nam!!var!"
))
set "name1=!name1:~1!"
goto lp
)
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@echo off
set "code=a b c d e f g h i j k l m n o p q r s t u v w x y z"
for /f "delims=" %%a in ('dir /s /a-d /b') do (
    if "%%~nxa" neq "重命名.bat" (
       set "str=%%~na"&set "file=%%a"&set "var=%%~na"
       setlocal enabledelayedexpansion
       for %%i in (%code%) do set "str=!str:%%i=!"
       set "str=!str: =!"&call :lp
       ren "!file!" !files!%%~xa
       endlocal
))
goto :eof
:lp
set /a n+=1
for /f "tokens=%n% delims=%str% " %%a in ("%var%") do (
     if "%%a" neq "" set "files=!files!%%a"&goto lp
)
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@echo off
for /f "delims=" %%a in ('dir /b/a-d "*.*"') do (
   if not "%%~nxa"=="%~nx0" (
      set "more=%%a"&set "mo=%%~na"&set "n=0"&set "ming="
      setlocal enabledelayedexpansion
      call :mo
      ren "!more!" "!ming!%%~xa"
      endlocal
   )
)
pause&exit
:mo
if not "!mo:~%n%,1!"=="" (
   set "niu=!mo:~%n%,1!"
   call :niu
   set /a "n+=1"
   goto :mo
)
goto :eof
:niu
for %%b in (a b c d e f g h i j k l m n o p q r s t u v w x y z) do (
   if /i "%niu%"=="%%b" (set "ming=!ming!%niu%"&goto :eof)
)
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@echo off
for %%i in (a b c d e f g h i j k l m n o p q r s t u v w x y z) do set %%i=a
for %%i in (*.*) do (
    if not "%%~nxi"=="%~nx0" (
        set "name=%%~ni"
        setlocal enabledelayedexpansion
        set name1=!name!
        call :lp
        ren "!name!%%~xi" "!nam!%%~xi"
        set "nam="
        endlocal
     )
  )
pause&goto :eof
:lp
if defined name1 (
   set "var=!name1:~,1!"
   if defined !var! set "nam=!nam!!var!"
   set name1=!name1:~1!
   goto lp
)
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@echo off
for %%a in (*.*) do (
 if "%%~nxa" neq "%~nx0" (
 set "name=%%~na"
 call,set name=%%name: =%%
 call,set name=%%name:!=%%
 setlocal enabledelayedexpansion
 for /l %%s in (0 1 9) do set name=!name:%%s=!
 set name=!name:%%=!
 for %%s in (@ _ # . $ - ^&) do set name=!name:%%s=!
 call :lp !name!
 echo !nam!%%~xa&set "nam="
 endlocal
))
pause&exit/b
:lp
for /f "tokens=1* delims=~" %%l in ("%1") do (
 set "n=!n!%%l
 if "%%m" neq "" (
 call :lp %%m
 ) else (
 for %%a in (a b c d e f g h i j k l m n o p q r s t u v w x y z) do set n=!n:%%a= %%a !
 for %%a in (!n!) do if "%%a" geq "a" if "%%a" leq "Z" set nam=!nam!%%a
))
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@echo off
set "z=a b c d e f g h i j k l m n o p q r s t u v w x y z"
for /f "delims=" %%a in ('dir /b *^|findstr /vc:"%~nx0"') do (
set k=
set wenben=%%~na
set wenjian=%%a
setlocal enabledelayedexpansion
	for /l %%b in (0,1,50) do (
	    set zimu=!wenben:~%%b,1!
		for %%c in (!z!) do (
	  	    if /i "!zimu!"=="%%c" set k=!k!!zimu!
	  	)
	)
ren "!wenjian!" "!k!%%~xa"
endlocal
)
pause
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for /f "tokens=%n% delims=%str% " %%a in ("%var%") 
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for /f "tokens=%n% delims=%str% " %%a in ("!var!")
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@echo off
cd /d %~dp0
::思路：通过字母字符范围大小，逐个字符比较，保留英文字母。
for /f "delims=" %%i in ('dir /b /a-d') do (
	::排除批处理自身
	if "%%~nxi" neq "%~nx0" (	
		
		::截取文件名，不含扩展名
		set "name=%%~ni" & set "old=%%~nxi"
		::避免文件名中有感叹号，动态感知变量值的变化
		setlocal enabledelayedexpansion
		
		set "name1=!name!" & call :loop
		echo;!nam!		
		ren "!old!" "!nam!%%~xi"
		
		::用完一次清除该变量。避免下次使用还有残留值。
		set "nam="	
		
		endlocal
	)
)

pause>nul & goto :eof

:loop
if defined name1 (
	::逐个截取字符作判断
	set "var=!name1:~0,1!"
	::忽略大小写，保证值在字母头尾之间
	if /i "!var!" leq "Z" (
		if /i "!var!" geq "A" (
			::满足上面两个条件下作字符串拼接，即有效文件名拼接。
			set "nam=!nam!!var!"
		)
	)
	::每次循环后，从左往右依次截断字符串。直至把字符串截取完成空。
	set "name1=!name1:~1!"
	goto loop
)
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@echo off
for %%a in (*) do (
    if "%%~nxa" neq "%~nx0" (
        set "filename=%%~na"
        set "str=%%a"
        setlocal enabledelayedexpansion
        set "filename=!filename: =!
        for /l %%b in (0,1,50) do (
            set "str1=!filename:~%%b,1!"
            echo,!str1!|findstr [a-z]>nul 2>nul&&set str2=!str2!!str1!
        )
        ren "!str!" "!str2!%%~xa"
        set str2=
        endlocal
    )
)
pause
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