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@ 2013-10-16T20:22:28Z

<?php
$str = "&lt;p>This is a good text, but it's
very tedious.&lt;/p>";
$str = preg_replace("/(?<!\.)&lt;\/p>/", "$1.&lt;\/p>", $str);
echo $str;

Output
Performance
VLD
References
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preg_replace: documentation ( source)

preferences:dark modelive preview

45.45 ms | 402 KiB | 5 Q