Improvements to social media preview URL regexes

rocketbot/cogs/videopreviewcog.py

 		brief='whether to show video previews for Twitter links',
 	)
 
-	REGEX_INSTAGRAM_POST = r'https?:\/\/(?:www\.)?instagram\.com\/(?:p|reel)\/[a-zA-Z0-9_-]+\/?'
-	REGEX_FACEBOOK_POST = r'https?:\/\/(?:www\.)?facebook\.com\/share\/[rv]\/[a-zA-Z0-9_-]+\/?'
-	REGEX_TWITTER_POST = r'https?:\/\/(?:twitter|x)\.com\/[a-zA-Z0-9_-]+/status/[0-9]+'
+	REGEX_INSTAGRAM_POST = r'(https?:\/\/(?:www\.)?)\w*(instagram\.com\/\w+/\w+\/?)'
+	REGEX_FACEBOOK_POST = r'(https?:\/\/(?:www\.)?)\w*(facebook\.com(?:\/\w+)+\/\w+\/?)'
+	REGEX_TWITTER_POST = r'(https?:\/\/(?:www\.)?)\w*((?:twitter|x)\.com\/\w+\/status\/[0-9]+)'
 
 	REGEX_SPOILERS = '\|\|.+\|\|'
 
 		has_spoilers = re.match(Self.REGEX_SPOILERS, content) is not None
 		if self.get_guild_setting(message.guild, Self.SETTING_INSTAGRAM):
 			for link in re.findall(Self.REGEX_INSTAGRAM_POST, content):
-				links.append(MessageLink(link, 'instagram', has_spoilers))
+				url = link[0] + link[1]
+				links.append(MessageLink(url, 'instagram', has_spoilers))
 		if self.get_guild_setting(message.guild, Self.SETTING_FACEBOOK):
 			for link in re.findall(Self.REGEX_FACEBOOK_POST, content):
-				links.append(MessageLink(link, 'facebook', has_spoilers))
+				url = link[0] + link[1]
+				links.append(MessageLink(url, 'facebook', has_spoilers))
 		if self.get_guild_setting(message.guild, Self.SETTING_TWITTER):
 			for link in re.findall(Self.REGEX_TWITTER_POST, content):
-				links.append(MessageLink(link, 'twitter', has_spoilers))
+				url = link[0] + link[1]
+				links.append(MessageLink(url, 'twitter', has_spoilers))
 		# TODO: Custom patterns
 		return links