I ran into this same problem and changing in os-testr:
exclude_regex = "^((?!" + exclude_regex + ").)*$"
to
exclude_regex = "^((?!" + exclude_regex + ").)*"
made it work for me too
I ran into this same problem and changing in os-testr:
exclude_regex = "^((?!" + exclude_regex + ").)*$"
to
exclude_regex = "^((?!" + exclude_regex + ").)*"
made it work for me too