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@ 2013-12-17T15:15:39Z

<?php

$a="a-zA-Z0-9.-_~!$&'()*+,;=:@";
echo $a;
echo PHO_EOL;
echo preg_quote($a);

Output
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preg_quote: documentation ( source)

preferences:dark modelive preview

33.37 ms | 402 KiB | 5 Q