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External Data Source

Source

Regular Expression
^((nntp|sftp|ftp(s)?|http(s)?|gopher|news|file|telnet):\/\/)?(([a-zA-Z0-9\._-]*([a-zA-Z0-9]\.[a-zA-Z0-9])[a-zA-Z]{1,6})|(([0-9]{1,3}\.){3}[0-9]{1,3}))(:\d+)?(\/[^:][^\s]*)?$