The obscured mails I know are normally shortened resp. normalized, may I suggest that you always use ... three dots?

something like

  DB<98> say "$_:\t", $_ =~ s/(\w\w).*\@.*(\.\w*)/$1...\@...$2/r for q
+w/someone@example.co.uk andrew.test@some.company.co.uk jo@abc.com/

someone@example.co.uk:  so...@....uk
andrew.test@some.company.co.uk: an...@....uk
jo@abc.com:     jo...@....com

[download]

?

YMMV

edit

FWIW your code is (mostly) OK, but you should really always do it in an if-block to test for a successful match first

if( $em =~ /^(\w[\w|\.]).*@(\w\w).*\.(\w+)$/ ) {
    $em = $1 . '.' x (length($name) - 2) . "\@$2" . '.' x (length($com
+p) - length($3) - 2) . $3;
}

[download]

and you might get bitten by variable interpolation if you don't escape the "@" in a regex: \@

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re: Counting characters within regexp by LanX
in thread Counting characters within regexp by Bod

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