This is a warning to the _programmer_ telling you shouldn't be using POSIX regular expressions because they will be removed in PHP 6.  So when PHP 6 is released Nuke will no longer work and needs to be written differently.  Doesn't mean they wont work in any version of PHP 5, just that they are DEPRECATED (discouraged from using).  To someone installing the software these warnings mean nothing bad.  The only way to fix it is to open the files and rewrite it with Perl regular expressions.  Regular expressions are tools programmers use to process text and have nothing to do with settings or databases.  

So, again, my recommendation is to remove these warnings because they can be ignored.

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If you want to remove the error you need to turn off E_DEPRECATED for error_reporting in php.ini.

error_reporting = E_ALL &amp; ~E_DEPRECATED

Or turn off error_reporting all together.
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