It isn't easy to product a complement of regular expression. Very long and exhausting calculations :( For alphabet {a,b} (and if I didn't miscalculate) it is ...
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regex-no-consecutive-numbers
Valid numbers are: 1.0, . · A number can start with a sign (- or +) or with a digit. · The character before a minus or a plus, if there is any, can not be another digit, a​ ... 939c2ea5af