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External Data Source

Source

Regular Expression
^(((?:(?:f|ht)tps?(?!\:\/\/[-\.\w]+@)|mailto(?=\:\/\/[-\.\w]+@))\:\/\/)?(?:((?:(?:(?:2(?:[0-4]\d|5[0-5])|[01]?\d?\d))(?:\.(?:2(?:[0-4]\d|5[0-5])|[01]?\d?\d)){3})|(?:(?:[a-zA-Z0-9](?:[-\w]*[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}(?:(?:\/[-\w]+(?=\/))*)?)|(?:[0-9a-zA-Z](?:[-.\w]*[0-9a-zA-Z])?@(?:[0-9a-zA-Z](?:[-\w]*[0-9a-zA-Z])?\.)+[a-zA-Z]{2,6}(?![\/\?])))(\/[-\w]+)?(?:(?<=\w)\.([a-zA-Z0-9]{2,4}))?(?:(?<=\w)\?([a-zA-Z][-\w]*=[-\w]+(?:&[a-zA-Z][-\w]*=[-\w]+)*))?))$