Use of regular expressions in selectizeInput in Shiny app

Hi @heeringa! Since you waited several days before cross-posting this to SO, I think that falls into the realm of accepted cross-posting strategies. I would recommend that in the future if you take this route on a question that has not been answered, to please just post a link to the cross-post so that future would-be answer-ers don't spend time trying to solve a question that has already been answered.

I would recommend posting the same to SO.

Here is the related FAQ for the topic: FAQ: Is it OK if I cross-post?