@echo off & setlocal enabledelayedexpansion

:main
    set count=0
    call:fopen one.txt text
    set /A lines=fopen_len-1
    for /L %%i in (0,1,%lines%) do (
        call:len text[%%i]
        call:deal %%i
    )
    echo %count%
    pause
goto:eof

:deal
    set word=!text[%~1]!
    set /A len-=2
    for /L %%i in (0,1,%len%) do if /I "!word:~%%i,3!"=="mp3" set /A count+=1
goto:eof

:len
    set len_cpy=!%~1!
    set len=0
    for %%i in (1024,512,256,128,64,32,16,8,4,2,1) do if not "!len_cpy:~%%i,1!"=="" (
        set /A len+=%%i
        set len_cpy=!len_cpy:~%%i!
    )
goto:eof

:fopen
    set fopen_file=%~1
    if "%~2"=="" ( set "fopen_vale=%~n1" ) else ( set "fopen_vale=%~2" )
    set fopen_len=0
    for /F "tokens=1* delims=:" %%i in ('findstr /n .* %fopen_file%') do (
        set %fopen_vale%[!fopen_len!]=%%j
        set /A fopen_len+=1
    )
goto:eof
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@echo off
set "file=C:\Users\lenovo\Desktop\1.txt"
set "key=mp3"
powershell -c "[System.Text.RegularExpressions.Regex]::Matches((Get-Content '%file%' | Out-String),'%key%').Count"
pause&exit
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