general

there are code blocks for a reason

:LOOP
setlocal ENABLEDELAYEDEXPANSION
FOR /R %%X IN (*.mp3) DO (
    IF NOT "%%~dpX"=="!LASTPATH!" (SET /A COUNT=0) ELSE (SET /A COUNT=!COUNT!+1)
    SET LASTPATH=%%~dpX
    :: make sure we don't rename songs in the root folder
    IF NOT "%%~dpX"=="%CD%" (
        REN "%%X" song!COUNT!.mp3
        ECHO Renamed %%X to song!COUNT!.mp3
    )
)
endlocal

:End
PAUSE

import re
for test_string in ['555-1212', 'ILL-EGAL']:
    if re.match(r'^\d{3}-\d{4}$', test_string):
        print test_string, 'is a valid US local phone number'
    else:
        print test_string, 'rejected'

:LOOP
setlocal ENABLEDELAYEDEXPANSION
FOR /R %%X IN (*.mp3) DO (
    IF NOT "%%~dpX"=="!LASTPATH!" (SET /A COUNT=0) ELSE (SET /A COUNT=!COUNT!+1)
    SET LASTPATH=%%~dpX
    :: make sure we don't rename songs in the root folder
    IF NOT "%%~dpX"=="%CD%" (
        REN "%%X" song!COUNT!.mp3
        ECHO Renamed %%X to song!COUNT!.mp3
    )
)
endlocal

:End
PAUSE

:LOOP
setlocal ENABLEDELAYEDEXPANSION
FOR /R %%X IN (*.mp3) DO (
    IF NOT "%%~dpX"=="!LASTPATH!" (SET /A COUNT=0) ELSE (SET /A COUNT=!COUNT!+1)
    SET LASTPATH=%%~dpX
    :: make sure we don't rename songs in the root folder
    IF NOT "%%~dpX"=="%CD%" (
        REN "%%X" song!COUNT!.mp3
        ECHO Renamed %%X to song!COUNT!.mp3
    )
)
endlocal

:End
PAUSE

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