These three words are often used wrongly, but actually they are quite easy to get right.

Rules are made by just about any group of people that are brought together:
Families may create rules so that life can proceed smoothly.
Clothes only get washed if they are in the laundry basket.
Dinner is to be eaten together at the table, not in front of the TV or computer.

Clubs usually have rules to govern behaviour:
Guests must be signed in by a member.
Membership fees must be paid by a certain date or membership lapses.

Companies often have rules for employees:
All employees must clock in at the start of work, and clock out before they go home.
Travel expenses claims must be filed before the 5th day of the following month.

Regulations are created by official government departments:
Vehicle construction regulations ensure vehicle safety.
Public health regulations control how restaurants store and prepare food.
Parking regulations serve to raise revenue and annoy drivers.

Laws are created at top government level.