Update Core.php

* add function_exists for mb_regex_encoding in case is not enabled on the server
Format code. #mania
[auto] Merge from Core

    • #92cbe08 — Update Core.php (ncosmin2001, 2014-03-26)
    • #cb09de5 — Format code. #mania (Ivan Enderlin, 2014-03-26)

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Merge branch 'master' of /var/lib/git/repositories/Library/Core