<?php
$html = "<html>\n<body>\n<p>Hel<i>l</i>o <em>進撃の巨人</em>!</p>\nrandom code\nrandom code\n<p>Lorem <span>ipsum<span>.</p>\n</body>\n </html>";
$begin = 'Hello 進撃の巨人!';
$end = 'Lorem ipsum.';
. "(.*?)" .
//echo $reg .PHP_EOL;
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