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What did you end up going with? I've been using this REGEX_Match([Email_address_1], '.+@.+\..+') but it lets through emails with spaces in them which I could remove but I recently read that spaces can be allowed in an email address in some instances. But Salesforce.com doesn't allow them when I send them data. I wonder what their validation process is based on.
I found myself in a rabbit hole on the StackOverflow discussion and then Dominic Sayers blog seemed pretty good but then how to incorporate his PHP program into Alteryx work flow... Anyway curious where you ended up with your email syntax validation. I was just looking for basic syntax check to remove things like noemail and NA and all that when I started this project.