The phrase "a regular phenomenon in" is correct and usable in written English.
It can be used to describe something that occurs frequently or consistently within a specific context or area.
Example: "Climate change has become a regular phenomenon in many parts of the world, affecting weather patterns and ecosystems."
Alternatives: "a common occurrence in" or "a frequent event in".
The agency noted that forest fires are a regular phenomenon in Chile, but have been more frequent in recent years.
This loss even excludes the losses Bangladesh has incurred because of floods and river bank erosion which has become a regular phenomenon in the country (Table 2).
Drought is a regular phenomenon in Ethiopia.
In response to this situation, reforms of the health systems have become a regular phenomenon in Africa over the last 30 years.
From the 4th century on, the emperors occasionally intervened to fill important sees, but such occurrences were not a regular phenomenon (until the 6th century in Merovingian Gaul).
This is a regular phenomenon -- Russian immigrants living in the U.S. often still watch pro-Kremlin channels, support Putin and hold fast to many Soviet views.
"Although the incidence of cyber-attack in developed countries is a regular phenomenon, it is entirely new to Bangladesh".
The resistance values revealed a regular phenomenon of decreased variation step by step with reset reaction procedure shown in the magnified inset of Figure 4.
In mice, hyperplasia of the colonic mucosa is a regular phenomenon after a challenge with colonic carcinogens indicating that mucosal hyperproliferation and thickening, even without cytological dysplasia, represents an early pre-malignant change.
Ensuring that earthquakes – a regular phenomena here in the Pacific 'Ring of Fire' – do not stand in the way of immunization is at the heart.
Ensuring that earthquakes – a regular phenomena here in the Pacific 'Ring of Fire' – do not stand in the way of immunization is at the heart of UNICEF's response.
