[alpap]

А нельзя сделать так: »

можно
(именно под маску: 12345678:12345678:12345678)

Код:

@echo off
set m=[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]

for /f "delims=" %%a in (
 'mshta "javascript:var x=clipboardData.getData('text');if(x)new ActiveXObject('Scripting.FileSystemObject').GetStandardStream(1).Write(x);close();"'
) do set "z=%%a"& call :#
pause& exit

:#
 for /f "tokens=1-3 delims=:" %%a in ("%z%") do (
  echo %%a|>nul findstr /rc:"^%m%$"&& (set a1=%%a)|| (goto err)
  echo %%b|>nul findstr /rc:"^%m%$"&& (set a2=%%b)|| (goto err)
  echo %%c|>nul findstr /rc:"^%m%$"&& (set a3=%%c)|| (goto err)
 )
 echo %a1%.%a2%.%a3%
exit /b

:err
 echo ERROR& pause
exit /b