Userモデルに以下の記述を追加することでバリデーションを追加できます。
user.rb
# ...
VALID_PASSWORD_REGEX = /\A(?=.*?[a-z])(?=.*?[\d])[a-z\d]+\z/i
validates :password, format: { with: VALID_PASSWORD_REGEX, message: 'は半角英数を両方含む必要があります’}
# ...
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