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External Data Source

Source

Regular Expression
/^(https?|ftp)(:\/\/)(([\w]{3,}\.[\w]+\.[\w]{2,6})|([\d]{3}\.[\d]{1,3}\.[\d]{3}\.[\d]{1,3}))(\:[0,9]+)*(\/?$|((\/[\w\W]+)+\.[\w]{3,4})?$)/