The phrase "regarding the difficulty" is correct and can be used in written English.
It is typically used to introduce a statement or idea that relates to a specific challenge or obstacle. Example: Regarding the difficulty of the project, we have encountered numerous setbacks that have delayed our progress.
In truth, the writing had been on the wall regarding the difficulty of a Rice nomination for weeks.
The WEF report found that 51% of the 103 countries for which data was available saw their inclusive development index scores decline over the past five years, "attesting to the legitimacy of public concern and the challenge facing policymakers regarding the difficulty of translating economic growth into broad social progress".
This would be an issue regarding the difficulty to recruit such patients.
However, little is known regarding the difficulty in proper placement of the PAC in those patients.
Regarding the difficulty of accurate interpretation of TCD's values, improvement of TCD's use is necessary.
Another critical factor regarding the difficulty in managing bilateral asymmetric relationship is the global enlargement of asymmetric relations as a consequence of internationally entangled security politics.
He suggests that his constituents' anger regarding the difficulties that exist in Long Island's school systems is the only avenue they have to lash out against high taxes.
"None of that has even resonated with us" — Ellis's statement shows a stunning lack of empathy for the victims, and a particular tone-deafness regarding the difficulties of prosecuting domestic-violence cases.
This represents a change from an earlier draft of the Guidelinesand is an attempt to address some of the airlines' concerns regarding the difficulties of lengthy disclosures in broadcast commercials.
These observations do not contradict the observations regarding the difficulties of valuing data: to ascertain the qualitative fact of diminishing value, one does not have to know how to measure it precisely.
The Chamber participants echoed well-known concerns regarding the difficulties with the CADIVI foreign exchange controls and voiced caution regarding the use of the parallel permuta rate because they do not want to be seen as possibly operating on the margins of Venezuelan law.
