When using the UI with regex to search for experiments, due to the greedy nature of the search, it consistently pops up the "ERROR Fetch Experiments failed" window when starting to use groups in regex (that is, parentheses of any kind).

hmm that is a good point (i.e. only on enter it would actually search)

Could it be updated so that if an invalid regex pattern is given, it simply highlights the search bar in red (or similar) rather than stop us while writing the search pattern?

Either enter or longer timeout ? (not sure if the UI validates the regexp or the backened does)