# How do I highlight particular authors in a bibliography?

I'd like to indicate one or more authors in a bibliography entry that should be highlighted, e.g., boldface. This solution allows one to indicate one author from the list, using an index provided in the auxiliary field usera.

How would the solution be changed in order to allow multiple authors, e.g.,

author = {J. Doe and J. Smith and J. Quincy}
usera = {1,3}


This would result in the first and third authors being highlighted.

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You can parse the usera field using \docsvfield. Here is a simplified macro from the linked solution that will set all author names indicated by usera in italics.
\newbibmacro*{name:emph}{%