findstr "^[0-9]*[0-9]$"
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findstr  "^[A-Z]*[A-Z]$"
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findstr /v "^[0-9]*[0-9]$"|findstr /v  "^[A-Z]*[A-Z]$"
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(echo;测试字串|findstr /r /c:"^[A-Z][A-Z]*[0-9][A-Z0-9]*$" /c:"^[0-9][0-9]*[A-Z][A-Z0-9]*$" >nul)&&echo;字母数字混合||echo;非字母数字混合
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set str=123
set/a 1%str%1 2>nul&&echo;纯数字||echo;含非数字
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@echo off&setlocal enabledelayedexpansion
set str=123#
for /l %%a in (0 1 9) do set str=!str:%%a=!
if "%str%" equ "#" (echo;纯数字) else echo;含非数字
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@echo off&setlocal enabledelayedexpansion
set str=agt#
for %%a in (a b c d e f g h i j k l n m o p q r s t u v w x y z) do set str=!str:%%a=!
if "%str%" equ "#" (echo;纯字母) else echo;含非字母
pause
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@echo off

set "阿拉伯数字=0123456789"
set "大写字母=ABCDEFGHIJKLMNOPQRSTUVWXYZ"
set "小写字母=abcdefghijklmnopqrstuvwxyz"

for /f "tokens=1*delims=%阿拉伯数字%%大写字母%%小写字母%"eol^= %%a in (
   "#你的字符串#"
) do (
   if %%b==# (echo 合法) else (echo 不合法)
)

pause
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