Update channel regex

Co-authored-by: bashonly <88596187+bashonly@users.noreply.github.com>

yt_dlp/extractor/floatplane.py

@@ -174,9 +174,8 @@ class FloatplaneIE(InfoExtractor):
             })
 
         uploader_url = format_field(traverse_obj(
-            post_data, ('creator', 'urlname')), template='https://www.floatplane.com/channel/%s/home', default=None)
-        channel_url = format_field(traverse_obj(
-            post_data, ('channel', 'urlname')), template=f'{uploader_url}/%s', default=None)
+            post_data, 'creator'), 'urlname', 'https://www.floatplane.com/channel/%s/home', default=None)
+        channel_url = urljoin(f'{uploader_url}/', traverse_obj(post_data, ('channel', 'urlname')))
 
         post_info = {
             'id': post_id,
@@ -207,7 +206,7 @@ class FloatplaneIE(InfoExtractor):
 
 
 class FloatplaneChannelIE(InfoExtractor):
-    _VALID_URL = r'https?://(?:(?:www|beta)\.)?floatplane\.com/channel/(?P<id>[\w_]+)/home(?:/(?P<channel>[\w_]+))?'
+    _VALID_URL = r'https?://(?:(?:www|beta)\.)?floatplane\.com/channel/(?P<id>[\w-]+)/home(?:/(?P<channel>[\w-]+))?'
     _PAGE_SIZE = 20
     _TESTS = [{
         'url': 'https://www.floatplane.com/channel/linustechtips/home/ltxexpo',
@@ -260,7 +259,7 @@ class FloatplaneChannelIE(InfoExtractor):
             'https://www.floatplane.com/api/v3/creator/named', display_id, query={'creatorURL[0]': creator})[0]
 
         channel_data = traverse_obj(
-            creator_data, ('channels', lambda _, x: x['urlname'] == channel, {dict}), get_all=False) or {}
+            creator_data, ('channels', lambda _, v: v['urlname'] == channel, {dict}), get_all=False) or {}
 
         return self.playlist_result(OnDemandPagedList(functools.partial(
             self._fetch_page, display_id, creator_data['id'], channel_data.get('id')), self._PAGE_SIZE), display_id,