Due this Wagtail issue (wagtail/wagtail#3653) filtering entries by author with usernames with dots is not possible. So you cannot write something like this PUPUT_USERNAME_REGEX = '[-\w\.]+'. A possible workaround is overwrite the wagtailcore/urls.py file and replace:
serve_pattern = r'^((?:[\w-]+/))$'
with
serve_pattern = r'^((?:[\w-]+/)|.*)$'
Due this Wagtail issue (wagtail/wagtail#3653) filtering entries by author with usernames with dots is not possible. So you cannot write something like this
PUPUT_USERNAME_REGEX = '[-\w\.]+'. A possible workaround is overwrite thewagtailcore/urls.pyfile and replace:serve_pattern = r'^((?:[\w-]+/))$'with
serve_pattern = r'^((?:[\w-]+/)|.*)$'