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^(?![^a-z]*$)(?![^A-Z]*$)(?![^0-9]*$)[^\s]{6,20}$
//匹配则满足1 2 3
(.)([^\1]*\1){2,}
//不匹配满足4
//同一字符不允许连续出现3个以上
^(?![^a-z]+$)(?![^A-Z]+$)(?![^0-9]+$)(?:([a-zA-Z0-9~!@#$%^&*()_+])(?!\1{2,})){6,20}$
//同一字符不允许任意位置出现3个以上
^(?![^a-z]+$)(?![^A-Z]+$)(?![^0-9]+$)(?:([a-zA-Z0-9~!@#$%^&*()_+])(?!(.*\1){2,})){6,20}$