"regardless of the validity" is correct and can be used in written English.
It is used to express that something is true or relevant despite there being doubts about its authenticity or correctness. For example, "He accepted her apology, regardless of the validity of her explanation."
Regardless of the validity of this method, learning about textual editing helped me think about the spread of information more generally.
I would make it clear that the Federal Constitution forbids a conviction on the facts of this record, regardless of the validity of the ordinance involved.
Park guest William may or may not be the sadistic Man in Black, but regardless of the validity of that theory, he absolutely blew a gasket in episode nine and might be trending toward a more sinister mindset.
Regardless of how long one has been here, regardless of the validity of one's opinion, regardless, even, it seems, of serving in the military during a war, the immigrant's stake is limited.
Regardless of the validity of the verdict, the outcome of "lawful killing" has created, for many of the boys I work with, a sense that a black life is worth very little.
Regardless of the validity of the dissenters' views - and similar criticism stretches back to the days of Kevin Hickey as the national team coach in the Eighties - so blind to the greater cause were they that they felt no guilt about letting the dirt fly at a time that suited them and not the team.
Regardless of the rumors validity, iPad 2 is on its way soon.
Regardless of the scientific validity of HIA conclusions, HIA practitioners should expect some skepticism regarding complex health arguments that involve environmental, social, and behavior pathways.
By the way, cosmologists are well aware of existing parallels and use them often (Lee Smolin with his cosmic selection – regardless of the ultimate validity of his theory, it is certainly respectable – is the best example).
Regardless of the scientific validity and the controversy of the health benefits of drinking wine, this notion has substantially created the widespread misconception among the public that wine is less associated with alcoholism and by implication allegedly less harmful than beer or spirits.
Regardless of the relative validity of each of these hypotheses [ 11, 12], there are now enough genome-wide association studies to be able to say something about the frequencies and ancestral or derived state of disease-associated alleles relative to HapMap and neutral expectations.
