Is regex code a 100% way of validating e-mail address?

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there's no 100% in life.
you could use awk for that purpose too.
https://goo.gl/ZAoFhr
AWK - Wikipedia

100%? No.
99.99%? Yes, apparently.
http://emailregex.com/

@PaperBag nice! 👍

@PaperBag oof, that perl regex

Just check if the adress has at least one @ and send out a verification mail.

https://youtu.be/xxX81WmXjPg

Thanks, everyone. The reason for this question is that I am currently doing User Acceptance Testing and I was checking the email field and how we validate it. I dove in a bit deeper and I found that the regex we using is not validating everything and some of the email addresses that are deemed valid here https://blogs.msdn.microsoft.com/te... are actually validated incorrect in our case.