combine two grep statements

Hi
I am wondering is it possible to combine two greps together
I have two greps.

grep "^[^,],[^,], *\." file 

(grep the line which has a '.' in the third column)

grep "=" file

(grep the line which has = anywhere)

How to put them together so that if the content of the file that match either condition, it gets greped?

Thanks

grep "^[^,],[^,], *\.\|=" file