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External Data Source

Source

Regular Expression
(?!^([0-9]+[-]?[0-9]+)$)(?!^([0-9]+[[\\s]*]?[0-9]+)$)^([0-9]+\.?[0-9]+$|(^[-]?[0-9]+([[\\s]*]?)$)|^([-]?)[0-9]+\.?[0-9]+([[\\s]*]?)|([0-9]+))$