<?php
$tests = ['name@mail.ru','@twitterUser','vas.pupkin@gmail.com.com'];
foreach( $tests AS $i=>$e) {
echo $matches[0].PHP_EOL;
} else {
echo "no match\n";
}
}
PD9waHAKCiR0ZXN0cyA9IFsnbmFtZUBtYWlsLnJ1JywnQHR3aXR0ZXJVc2VyJywndmFzLnB1cGtpbkBnbWFpbC5jb20uY29tJ107CmZvcmVhY2goICR0ZXN0cyBBUyAkaT0+JGUpIHsKICAgIGlmKCBwcmVnX21hdGNoKCAnLy4rKD89QCkvJywgJGUsICRtYXRjaGVzKSkgewogICAgICAgICBlY2hvICRtYXRjaGVzWzBdLlBIUF9FT0w7CiAgICB9IGVsc2UgewogICAgICAgICBlY2hvICJubyBtYXRjaFxuIjsKICAgIH0KfQ==