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External Data Source

Source

Regular Expression
^(0|(\+)?([1-9]{1}[0-9]{0,3})|([1-5]{1}[0-9]{1,4}|[6]{1}([0-4]{1}[0-9]{3}|[5]{1}([0-4]{1}[0-9]{2}|[5]{1}([0-2]{1}[0-9]{1}|[3]{1}[0-5]{1})))))$