Fix account and hashtag regex

app/models/account.rb

 class Account < ApplicationRecord
   include Targetable
 
-  MENTION_RE = /(?:^|[\s\.>*+])@([a-z0-9_]+(?:@[a-z0-9\.\-]+)?)/i
+  MENTION_RE = /(?:^|[^\/\w])@([a-z0-9_]+(?:@[a-z0-9\.\-]+)?)/i
   IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif'].freeze
 
   # Local users

app/models/tag.rb

 class Tag < ApplicationRecord
   has_and_belongs_to_many :statuses
 
-  HASHTAG_RE = /[?:^|\s|\.|>]#([[:word:]_]+)/i
+  HASHTAG_RE = /(?:^|[^\/\w])#([[:word:]_]+)/i
 
   validates :name, presence: true, uniqueness: true