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More nicely formatted version of email validator, in Perl

View email validator pretty.txt
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email: sub {
($val = @_);
return /
^
(
(
([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+
(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*
)
|
(
(\x22)
(
(
((\x20|\x09)*(\x0d\x0a))?
(\x20|\x09)+
)?
(
([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])
|
(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))
)
)*
(
((\x20|\x09)*(\x0d\x0a))?
(\x20|\x09)+
)?
(\x22)
)
)
@
(
(
([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])
|
(
([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])
([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*
([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])
)
)
\.
)+
(
([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])
|
(
([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])
([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*
([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])
)
)
\.?
$
/ix =~ $val;
}
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