The term 'REGARDING THIS' can be broken down into two crossword solutions, 'HEREOF' and 'HEREON'. 'HEREOF' is an adverb meaning 'of this' or 'concerning this', while 'HEREON' is an adverb meaning 'on this' or 'following this'. Both terms are used to refer to something that has been previously mentioned or discussed. They are often used in legal documents to refer back to a previous clause or section.