I don't undersand very well how this delimiters work…

My example is a list of authors with their biography:

“familyname, name; familyname, name. texttexttext…

familyname, name. texttexttext…”

I wanted to apply a character style just to the family names and I did those grep styles:

^[lu]+,

and

; [lu]+,

but the style applyed (obviously) to comas as well, and i just want the family name to be un such a style.

I tried with the Lookahead, but I don't manage to make it work…

Coul somebody help me?

Thanks in advance!