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@ 2013-10-03T22:08:43Z

<?php
$str = 'hello\_world\_again';
$str = preg_replace('/\_(.)/e', '$0', $str);

echo $str;

Output
Performance
VLD
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preg_replace: documentation ( source)

preferences:dark modelive preview

37.86 ms | 402 KiB | 5 Q