It's still not working correctly.
The code and files I am using are
egrep -v '^([0-9]\{7\}|[0-9]\{9\})/[0-9],[0-9A-Z]\{1,12\},[^ ]\{1,6\}$' test_saw.txt >> errors_saw.txt
test_saw.txt :-
0123456/1,AB,21
0321654/2,BC,22
02345678/3,CD,23
0987654/4,DE, 24
0654321/5,Ef,25
errors_saw.txt...