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@ 2019-03-21T05:18:52Z

<?php 
$text = "TEST#%_'JanE,.-_doc30)/||\.pdf$@!3)";
$text = preg_replace(array('/[^\dA-Za-z]+(?=.*\.[^.]+$)/',
                           '/_\./', 
                           '/(\.[\dA-Za-z]+).*$/'),
                     array('_', 
                           '.',
                           '$1'),
                     $text);
echo $text;

Output
Performance
VLD
References
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preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

34.25 ms | 404 KiB | 5 Q