@echo off& setlocal enableextensions enabledelayedexpansion

call:nx "Hello((test001))4589076.." "4"
echo %nx% would say 4589 because the 4 first continuous numb are 4589

call:nx "Hello((test002))4589076.." "4" "last"
echo %nx% would say 9076 because the 4 last cont numbers are 9076

call:nx "Hello((test003))4589076.." "8"
echo "%nx%" would say "" because there are not 8 cont numbers

call:nx "test4 2829...8455" "3"
echo %nx% would say 282

call:nx "test5 2829...8455" "3" "last"
echo %nx% would say 455

pause
exit /b
_______________

Benny Pedersen,
www.fineraw.com
_______________

:nx *[str] *[numb] *[]
set s=%~1& if defined s set s=!s:^)=]!& (set s=!s:^(=[!)
if "%~3"=="" (goto nx_L)else (set nx=)
: rvrs
if defined s (set nx=!s:~,1!%nx%& set s=!s:~1!& goto rvrs)else (
set s=%nx%)
: nx_L
if not defined s set nx=& exit /b 1
set /anx=%~2-1& for /L %%2 in (0,1,!nx!) do for /L %%9 in (0,1,9
) do if "%%9"=="!s:~%%2,1!" set /anx-=1
if %nx% lss 0 (
if "%~3"=="" (set nx=!s:~,%~2!)else (set /anx+=%~2& (
for /L %%2 in (0,1,!nx!
) do set nx=!s:~%%2,1!!nx!)& set nx=!nx:~,%~2!)
set s=& exit /b 0)
set /anx+=1
set s=!s:~%nx%!& goto nx_L