" In and with regard to, regarding, and as regards are all Standard, synonymous prepositions, slightly longer and more varied than but meaning much the same as about and concerning : I spoke to him regarding [as regards, in regard to, with regard to] his future . With regards to is Nonstandard and frequently functions as a shibboleth, although it can be Standard and idiomatic in complimentary closes to letters: With [my] regards to your family .... In regards to , however, is both Substandard and Vulgar, although it appears unfortunately often in the spoken language of some people who otherwise use Standard.
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