PARIS, March 23 (Reuters) - Police fired tear gas and fought with violent black-clad anarchists in Paris and across France on Thursday as hundreds of thousands of protesters marched against President Emmanuel Macron's plan to raise the pension age. "Unions called for regional action over the weekend and new nationwide strikes and protests on March 28, the day Britain's King Charles is due to travel to Bordeaux from Paris by train. See here for a complete list of exchanges and delays