Could you tell me ^ (?=. * ([a-z])?=. * ([a-z])?=. * \ d) [a zA - Z \ d] {8} $
In this expression, (?=. * [a-z]) and (?=. * [a-z]) and (?=. * \ d) together what is grammar? Why can together I can guess even up to meet at the same time, but the regular expression grammar book there is this one? Specifies the specific semantic together?