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External Data Source

Source

Regular Expression
^((http|HTTP|https|HTTPS|ftp|FTP?)\:\/\/)?((www|WWW)+\.)+(([0-9]{1,3}){3}[0-9]{1,3}\.|([\w!~*'()-]+\.)*([\w^-][\w-]{0,61})?[\w]\.[a-z]{2,6})(:[0-9]{1,4})?((\/*)|(\/+[\w!~*'().;?:@&=+$,%#-]+)+\/*)$