Regard can be a verb or a noun. As a verb it means to look at, to have an opinion about something or someone, or to give consideration to or hold in high esteem.
The manager regarded the intern’s calculations carefully. (looked at)
ExxonMobil generally regards PhD graduates as entry level. (opinion)
Joe Schmoe is highly regarded as a petrophysicist. (esteem)
As a noun “regard” means consideration, respect or esteem.
Due regard should be given for the cement to harden completely before pulling out of the hole. (consideration)
Give Joe Schmoe my regards when you get to Dubai. (respect)
Many people use “Regards” as their sign-off before they put their names at the end of an email or a letter. I don’t do this because then I have the song “Give My Regards To Broadway” stuck in my head the rest of the day. We sang and tap-danced to that song in my high school musical George M. I played Ethyl (Mrs. George M. Cohan) and Tommy Baker (George M. Cohan) had to kiss me, marry me, and carry me offstage.
Ah, but I reminisce….
Regardless is an adverb that means not being affected by something or despite everything.
Regardless, they pulled out of the hole before the cement had hardened.
Irregardless is not a word. Don’t use it. Use “regardless.”
And tell my husband Charlie that illrelevant is not a word, either.
Drives me nuts!