The usual "don't use a regex when a real parser exists" applies here too. Single quotes are technically a valid character in email addresses, as are commas and spaces when quoted. The following uses Email::Address to correctly parse and split such (admittedly very unusual and not recommended) addresses.
use warnings;
use strict;
use Email::Address;
while (<DATA>) {
for my $addr (Email::Address->parse($_)) {
print $addr->address, "\n";
}
}
__DATA__
'me'@here.com, "West, Casey" <casey@localhost>
"those,foo"@there.com others@there.com
you@there.com,them@there.com
"Hello, World"@example.com
Outputs:
'me'@here.com
casey@localhost
"those,foo"@there.com
others@there.com
you@there.com
them@there.com
"Hello, World"@example.com
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