Strings Php

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  4. Replacing using backreferences
$members=<<Name               E-Mail Address
------------------------------------------------
A      i@example.com
D      k@example.com
M      m@example.org
B      b@example.net
TEXT;
print preg_replace('/([^@\s]+)@(([-a-z0-9]+\.)+[a-z]{2,})/',
                   '\\1 at \\2', $members);