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@ 2017-07-13T22:23:17Z

<?php

$c = 'Al(OH)3';

$n = preg_replace('/\.*OH\)(/d)/i', '$1', $c);
echo $n;

Output
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preg_replace: documentation ( source)

preferences:dark modelive preview

38.6 ms | 402 KiB | 5 Q