"regain interest" is correct and usable in written English.
You can use it when describing someone or something that has rekindled their enthusiasm or interest in something. Example: After taking a break from running, I'm beginning to regain interest in the sport.
Writers and directors have been sharpening their skills on indie films the last several years while waiting for big distributors to regain interest.
Amateur investors have been so burned by the bear market that it may take a generation for them to regain interest in stocks.
Last fall, commentators cited the Grubman case as a prime example of the frivolous stories Americans focused on before Sept. 11 and wondered whether a country scarred by terrorism could ever regain interest.
As vegetarians age, they tend to regain interest in low-meat diets as a move toward healthier living.
"But small collaborations like this one with Colette, and those surely to come in the future, will be used to regain interest in what Gap has to offer".
Schottky junctions, homojunctions, heterojunctions, and nanocomposite heterojunctions based on Cu2O were studied two decades ago and lately started to regain interest.
As material quality improves and growth technology develops, SiC BJTs are regaining interest.
(He regained interest after passing her on to two other analysts: his wife and his mistress).
Regaining interest may be a problem, especially if the game has further delays.
So when did physicians lose site of nutrition's role in health, and why are they regaining interest now?
Both technologies were developed in the 1970s and 1980s and both regained interest lately due to recent developments in membrane technology and the need for sustainable energy processes.
