I have pattern file

==> cat pattern
def
bc

Datafile
==> cat testgrep.txt
abc,lmn
def,xyz
ghi,h
jkl

I tried this
==> /usr/xpg4/bin/grep -f pattern testgrep.txt
abc,lmn

==> /usr/xpg4/bin/grep -E -f pattern testgrep.txt
abc,lmn

==> /usr/xpg4/bin/grep -F -f pattern testgrep.txt
abc,lmn


I am not getting the second line which contains def.