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External Data Source

Source

Regular Expression
^((http|https|ftp):\/\/(www\.)?|www\.)[a-zA-Z0-9\_\-]+\.([a-zA-Z]{2,4}|[a-zA-Z]{2}\.[a-zA-Z]{2})(\/[a-zA-Z0-9\-\._\?\&=,'\+%\$#~]*)*$