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External Data Source

Source

Regular Expression
^(0|[-]{1}([1-9]{1}[0-9]{0,1}|[1]{1}([0-1]{1}[0-9]{1}|[2]{1}[0-8]{1}))|(\+)?([1-9]{1}[0-9]{0,1}|[1]{1}([0-1]{1}[0-9]{1}|[2]{1}[0-7]{1})))$