diff --git a/discord/ext/commands/converter.py b/discord/ext/commands/converter.py
index 89b87f80a..850ca728f 100644
--- a/discord/ext/commands/converter.py
+++ b/discord/ext/commands/converter.py
@@ -102,7 +102,7 @@ class Converter:
 
 class IDConverter(Converter):
     def __init__(self):
-        self._id_regex = re.compile(r'([0-9]{15,21})$')
+        self._id_regex = re.compile(r'([0-9]{15,20})$')
         super().__init__()
 
     def _get_id_match(self, argument):
@@ -265,11 +265,11 @@ class PartialMessageConverter(Converter):
     3. By message URL
     """
     def _get_id_matches(self, argument):
-        id_regex = re.compile(r'(?:(?P<channel_id>[0-9]{15,21})-)?(?P<message_id>[0-9]{15,21})$')
+        id_regex = re.compile(r'(?:(?P<channel_id>[0-9]{15,20})-)?(?P<message_id>[0-9]{15,20})$')
         link_regex = re.compile(
             r'https?://(?:(ptb|canary|www)\.)?discord(?:app)?\.com/channels/'
-            r'(?:[0-9]{15,21}|@me)'
-            r'/(?P<channel_id>[0-9]{15,21})/(?P<message_id>[0-9]{15,21})/?$'
+            r'(?:[0-9]{15,20}|@me)'
+            r'/(?P<channel_id>[0-9]{15,20})/(?P<message_id>[0-9]{15,20})/?$'
         )
         match = id_regex.match(argument) or link_regex.match(argument)
         if not match:
diff --git a/discord/utils.py b/discord/utils.py
index 24428c7a3..b99bd70bd 100644
--- a/discord/utils.py
+++ b/discord/utils.py
@@ -544,4 +544,4 @@ def escape_mentions(text):
     :class:`str`
         The text with the mentions removed.
     """
-    return re.sub(r'@(everyone|here|[!&]?[0-9]{17,21})', '@\u200b\\1', text)
+    return re.sub(r'@(everyone|here|[!&]?[0-9]{17,20})', '@\u200b\\1', text)
diff --git a/discord/webhook.py b/discord/webhook.py
index bdbc8eff1..9b22d42c6 100644
--- a/discord/webhook.py
+++ b/discord/webhook.py
@@ -687,7 +687,7 @@ class Webhook(Hashable):
             A partial webhook is just a webhook object with an ID and a token.
         """
 
-        m = re.search(r'discord(?:app)?.com/api/webhooks/(?P<id>[0-9]{17,21})/(?P<token>[A-Za-z0-9\.\-\_]{60,68})', url)
+        m = re.search(r'discord(?:app)?.com/api/webhooks/(?P<id>[0-9]{17,20})/(?P<token>[A-Za-z0-9\.\-\_]{60,68})', url)
         if m is None:
             raise InvalidArgument('Invalid webhook URL given.')
         data = m.groupdict()