I'm using this regex `(?<=\[')[^,]*` on a file containing the following line `disk = ['OVS/sdasd/asdasd/asdasd/something.img, w']`

I want that to return `OVS/sdasd/asdasd/asdasd/something.img`

How do I use `grep` to make it work?

I've tried `grep -P "(?<=\[')[^,]*"` but it returns the whole line.