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Removes invalid or broken HEX and HTML entities from string. These will not be matched since they are valid: € € These will be matched since they are invalid entities: & &eu &; &# &#83 Especially handy in case a string is being manipulated using e.g. substring, which may break entities in either the beginning or end of the string. One might consider using ^ and $ to make it match only beginning and/or end of string. http://regex101.com/r/pM9dE5/16