mangadex Invalid selection on urls with a trailing slash

This works: cum get https://mangadex.org/chapter/414899
This doesn't work:

cum get https://mangadex.org/chapter/414899/
==> Invalid selection "https://mangadex.org/chapter/414899/"

This is probably the responsible regex:

url_re = re.compile(
       r'(?:https?://mangadex\.(?:org|com))?/chapter/([0-9]+)'
       r'(?:/[^a-zA-Z0-9]|/?$)'
)

from: https://github.com/Hamuko/cum/blob/master/cum/scrapers/mangadex.py#L94