|regard / regardless / regards||
Regard v. usually means to have an opinion about something or someone.
For example: "I regard the theatre as the greatest of all art forms." Oscar Wilde
It can also mean to look carefully at something or someone.
For example: The students regarded me with horror as I entered the classroom.
Regardless adv. means not being affected by something.
For example: I went ahead with the test regardless of the students opposition.
Regards is simply a greeting.
For example: Please give my regards to your parents when you see them.
Regardless of how you regard someone, you should send them your regards.