Problem mit FINDSTR und Pfeil-nach-links Zeichen

ECHO off
SETLOCAL enabledelayedexpansion
FOR /f "delims=" %%i IN (inputfile.txt) DO (  
SET textline=%%i
echo !textline! | findstr SearchString
)
ECHO Done^^!

@ECHO off 
SETLOCAL

SET "searchstring1=CONTACT_FORMAT"  

FOR /f "delims=" %%i IN (inputfile.txt) DO (  
	SET "textline=%%i"  
	SETLOCAL enabledelayedexpansion
	if "!textline!" neq "!textline:%searchstring1%=!" (  
		CALL :findString "!textline!" %searchstring1% position  
		echo The last position of "CONTACT" in the line is %pos%	  
		) ELSE (
		REM Do nothing
		)
	ENDLOCAL
)
GOTO :ENDE

:findString -- returns position of first occurrence of a string in another string
::          -- %~1: in - varible name of a string to be searched
::          -- %~1: in - string to be found
::          -- %~3: out- return variable name, will be set to position or undefined if string not found

SETLOCAL ENABLEDELAYEDEXPANSION
set "pos="  
set "str=!%~1!"  

for /L %%a in (0,1,1023) do (
   set "s=!str:~%%a!"  
   if not defined pos if "%~2!s:*%~2=!"=="!s!" set "pos=%%a"  
)
ENDLOCAL (
IF "%~3" NEQ "" SET "%~3=%pos%"  
)
GOTO:EOF

:ENDE
ECHO Done^^!

@ECHO off 
SETLOCAL

SET "searchstring1=CONTACT_FORMAT"  
set pos=100

FOR /f "delims=" %%i IN (inputfile.txt) DO (  
	SET "textline=%%i"  
	SETLOCAL enabledelayedexpansion
	if "!textline!" neq "!textline:%searchstring1%=!" (  
		CALL :findString 15 34 %pos%
		echo The last position of "CONTACT_FORMAT": %pos%  
		) ELSE (
		REM Do nothing
		)
	ENDLOCAL
)
GOTO :ENDE

:findString -- returns position of first occurrence of a string in another string, case sensitive, maximum string length is 1023 characters
::          -- %~1: in - varible name of a string to be searched
::          -- %~1: in - string to be found
::          -- %~3: out- return variable name, will be set to position or undefined if string not found
SETLOCAL ENABLEDELAYEDEXPANSION
set var1=%1
set var2=%2
set var3=%3
set %3=199
echo %var1% and %var2% and %var3%
ENDLOCAL (
set %3=199
)
GOTO:EOF

:ENDE
ECHO Done^^!

@ECHO off 
SETLOCAL
echo Starte Fakturama auf deutsch
SET "fakturama_workdir=D:\Daten\Fakturama\Database\"  
SET "fakturama_progdir=C:\Programme\Fakturama\"  
SET "quell_datei=Database.script"  
SET "ziel_datei=Database.script.tmp"  
SET "searchstring4='CONTACT_FORMAT_GREETING_COMMON',"  
SET "searchstring3='CONTACT_FORMAT_GREETING_MR',"  
SET "searchstring2='CONTACT_FORMAT_GREETING_MS',"  
SET "searchstring1='CONTACT_FORMAT_GREETING_COMPANY',"  
SET "replacement4='Sehr geehrte Damen und Herren')"  
SET "replacement3='Sehr geehrter Herr {lastname}')"  
SET "replacement2='Sehr geehrte Frau {lastname}')"  
SET "replacement1='Sehr geehrte Damen und Herren')"  

REM Loeschen der Ausgabedatei, falls sie (noch) existiert
IF EXIST %ziel_datei% (DEL /f %ziel_datei% 1>NUL 2>NUL)

FOR /f "delims=" %%i IN (%fakturama_workdir%%quell_datei%) DO (  
	SET "textline=%%i"  
	SETLOCAL enabledelayedexpansion
	IF "!textline!" neq "!textline:%searchstring1%=!" (  
		call set rest=%%textline:*!searchstring1!=%%
		call set anfang=%%textline:!rest!=%%
		set NeueZeile=!anfang!!replacement1!
		ECHO !NeueZeile!>>%ziel_datei%
		) ELSE (
				IF "!textline!" neq "!textline:%searchstring2%=!" (  
				call set rest=%%textline:*!searchstring2!=%%
				call set anfang=%%textline:!rest!=%%
				set NeueZeile=!anfang!!replacement2!
				ECHO !NeueZeile!>>%ziel_datei%
				) ELSE (
						IF "!textline!" neq "!textline:%searchstring3%=!" (  
						call set rest=%%textline:*!searchstring3!=%%
						call set anfang=%%textline:!rest!=%%
						set NeueZeile=!anfang!!replacement3!
						ECHO !NeueZeile!>>%ziel_datei%
						) ELSE (
							IF "!textline!" neq "!textline:%searchstring4%=!" (  
							call set rest=%%textline:*!searchstring4!=%%
							call set anfang=%%textline:!rest!=%%
							set NeueZeile=!anfang!!replacement4!
							ECHO !NeueZeile!>>%ziel_datei%
							) ELSE (
								REM Write original line
								ECHO !textline!>>%ziel_datei%
									))))							
ENDLOCAL
)
DEL %fakturama_workdir%%quell_datei%
REN %fakturama_workdir%%ziel_datei% %quell_datei%	
START %fakturama_progdir%Fakturama.exe -nl de_DE