<?php
$re = '~^https?://(www\.)?twitter\.com/(#!/)?@?(?<name>[^/]+)(/\w+)*$~';
$str = 'https://t...content-available-to-author-only...r.com/#!/@tweet';
echo $m['name'];
}
PD9waHAKCiRyZSA9ICd+Xmh0dHBzPzovLyh3d3dcLik/dHdpdHRlclwuY29tLygjIS8pP0A/KD88bmFtZT5bXi9dKykoL1x3KykqJH4nOwokc3RyID0gJ2h0dHBzOi8vdC4uLmNvbnRlbnQtYXZhaWxhYmxlLXRvLWF1dGhvci1vbmx5Li4uci5jb20vIyEvQHR3ZWV0JzsKaWYgKHByZWdfbWF0Y2goJHJlLCAkc3RyLCAkbSkpIHsKCWVjaG8gJG1bJ25hbWUnXTsKfQ==