Ooops, didn't notice it was Perl! Saw the $variables and immediately read it as PowerShell. Still might work if there's a split method but I have absolutely no idea if there is!
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How Convert Email to ID@Domain.Suffix using Perl?
and break it apart into its components of:
$eMailID
$eMailDomain
$eMailSuffix
where
$itemAuthorEmail=user123@somewhere.net becomes:
$eMailID = user123
$eMailDomain = somewhere
$eMailSuffix = net
I am thinking this is easy, but I have having difficulty with figuring out how to write the code.