Untitled

My Regex
/,(,|\s)+,/

What I supply
gained their certificates: Intermediate, name,       ,       , , .[Sources] [Notes]

My Results
gained their certificates: Intermediate, name,       ,        .[Sources] [Notes]

What i expect
gained their certificates: Intermediate, name.[Sources] [Notes]

(USE: 

<?php
        $in = 'gained their certificates: Intermediate, name,       ,       , , .[Sources] [Notes]';

        $out = preg_replace( '/,\s\s.+\./', '.', $in );

        var_dump( $out );