Ok, I have a csv file like this:

```
14 ; 1234,56 ; 10203 ; "ABC" ; "DFG" ; "Lorem \n ipsum \n dolor sit" \n
15 ; 234,16 ; 10204 ; "ABC" ; "DFG" ; "Lorem \n ipsum \n dolor sit" \n
16 ; 1234,15 ; 10304 ; "CCC" ; "DFG" ; "Lorem ipsum/dolor \n sit amet\consec" \n

```

and so on...

The file has almost 550000 lines.
How do I replace all \n characters inside double quotes at once?

I'm using PHP 5. Could it be done by preg\_replace()?