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<?php $string = 'äöuu'; echo preg_replace('#(&\#*\w+)[\x00-\x20]+;#u',"$1;",$string); echo "\n"; $string = 'ss'; echo preg_replace('#(&\#*\w+)[\x00-\x20]+;#u',"$1;",$string);

Abusive script

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Output for 4.3.0 - 7.0.10
äöuu ss