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1.
^(?!(.*1){2,})(?!(.*2){2,})(?!(.*3){2,})(?!(.*4){2,})(?!(.*5){2,})(?!(.*6){2,})(?!(.*7){2,})(?!(.*8){2,})(?!(.*9){2,})\d+$
3: ^(?!(b*ab*ab*)*ab*$|(a*ba*ba*)*$)(a|b)*$
^(?!.*a.*b.*b)[ab]*$
^(?!.*abb)[ab]*$
^(?!这里应该填啥呢 - -#)(a|b)*$
1: ^(?![0-9]*([0-9])[0-9]*\1[0-9]*)[0-9]*$
2: ^(?![0-9]*([0-9])[0-9]*\1[0-9]*\1[0-9]*)[0-9]*$