if SiteSetting.unicode_usernames?
regexp = Regexp.new("(?i-mx:^\\@([a-zA-Z0-9_\\-#{SiteSetting.allowed_unicode_username_characters}]+)$)")
Search.advanced_filter(regexp) do |posts, match|
username = match.downcase
user_id = User.where(staged: false).where(username_lower: username).pluck_first(:id)
if !user_id && username == "me"
user_id = @guardian.user&.id
end
if user_id
posts.where("posts.user_id = #{user_id}")
else
posts.where("1 = 0")
end
end
end