Digitally encoded less than 65535 (port verification)
/^(\d|[0-9]\d{1,3}|[0-5]\d{4}|6([0-4]\d{3}|5([0-4]\d{2}|5([0-2]\d|3[0-4]))))$/
Digitally encoded less than 65535 (port verification)
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Origin www.cnblogs.com/hjbky/p/11497171.html
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