The phrase "a combination of regulations" is correct and usable in written English.
It can be used when referring to a set of rules or guidelines that are grouped together for a specific purpose or context.
Example: "The new policy is based on a combination of regulations from various government agencies to ensure compliance."
Alternatives: "a set of regulations" or "a collection of regulations".
Analysts expect that the changes ahead will largely mirror what happened to stock trading a decade ago, when a combination of regulations and new technology transformed buying and selling stocks into a more automated business.
The Environmental Protection Agency is expected to roll out a combination of regulations and voluntary guidelines for the oil and gas industry, people familiar with the plan said.
The Affordable Care Act, aka Obamacare, is a policy Rube Goldberg device — instead of doing the simple, obvious thing, which would just be to insure everyone, it basically relies on a combination of regulations and subsidies to rope, coddle, and nudge us into a rough approximation of a single-payer system.
The answer was a combination of regulation and informal guidelines.
The answer is supposed to lie in a combination of regulation and competition.
This has come about through a combination of regulation, efficiency and alternatives, not protest and certainly not divestment.
But a combination of regulation and technology has broken media monopolies.
Finally, the third route to universal coverage relies on private insurance companies, using a combination of regulation and subsidies to ensure that everyone is covered.
The average price spent on a normal vaginal delivery tops out at about $4,000 in Switzerland, France and the Netherlands, where charges are limited through a combination of regulation and price setting; mothers pay little of that cost.
You can do this purely with taxes, via a single-payer system (and maybe even by having the government act as provider), or you can do it, Swiss or Massachusetts style, via a combination of regulation, taxes, and subsidies.
More generally, comparing public spending and calling lower public spending a "saving" is deeply wrong when it comes to health care, where some countries simply pay for health care out of public funds, while others use a combination of regulation and subsidies to achieve similar result, but with lower on-budget outlays.
