set MyTextFile to read (choose file) 
set MyList to {"‰", "*", "$"} 
repeat with i from 1 to count of MyList 
	set MyCharacter to item i of MyList 
	set vorkommen to do shell script "grep -c " & quoted form of MyCharacter & "<<< " & quoted form of MyTextFile 
	if vorkommen as number is not 0 then 
		display dialog "String ist nicht konsistent" 
		exit repeat 
	end if 
end repeat 

set MyTextFile to read (choose file) 
set MyList to {"‰", "*"} 
set vorkommen to 0 
repeat with i from 1 to count of MyList 
	set MyCharacter to item i of MyList 
	try 
		set vorkommen to do shell script "grep -c " & quoted form of MyCharacter & "<<< " & quoted form of MyTextFile 
	end try 
	if vorkommen as number is greater than 0 then 
		display dialog "String ist nicht konsistent" 
		exit repeat 
	end if 
	end repeat