Translation of "Regards" in Arabic

In regards creativity,

فيما يخص الإبداع،

My best regards.

تحياتي الحارة

And similarly with regards to connectivity -

والأمر مشابه في مناطق اتصال أجزاء الدماغ

Warning! We do not question the myth of Santa Claus but his regards

حذاري! نحن لا نشك أسطورة سانتا كلوز ولكن تحياته

At the bottom of the letter he wrote "Kind regards," then signed his name.

كتب "مع أطيب التحيات" في آخر الرسالة ثم وقع اسمه.

- He wrote "Best regards" at the end of the letter and then went on to sign his name.
- He wrote "regards" at the end of the letter and then signed his name.

كتب "مع تحياتي" في ذيل الخطاب ثم قام بتوقيع اسمه.

- At the bottom of the letter he wrote "Kind regards," then signed his name.
- He wrote "Best regards" at the end of the letter and then went on to sign his name.

- كتب "مع أطيب التحيات" في آخر الرسالة ثم وقع اسمه.
- كتب "مع تحياتي" في ذيل الخطاب ثم قام بتوقيع اسمه.