您可以使用this正则表达式^(?!^[.])(?!.*[.]$)(?!.*[.]{2})[\w.'-]{1,64}$正则表达式分解^ #Start of string(?!^[.]) #Dot should not be in start(?!.*[.]$) #Dot should not be in start(?!.*[.]{2}) #No consecutive two dots[\w.'-]{1,64} #Match with the character set at least one times and at most 64 times.$ #End of string更正您的正则表达式- 不应介于字符类之间。它表示范围。避免在两者之间使用它[a-zA-Z0-9_] 相当于 \w
这是一个似乎有效的模式:^(?!.*\.\.)[a-zA-Z0-9_'-](?:[a-zA-Z0-9_'.-]{0,62}[a-zA-Z0-9_'-])?$以下是正则表达式模式的解释:^ from the start of the string (?!.*\.\.) assert that two consecutive dots do not appear anywhere [a-zA-Z0-9_'-] match an initial character (not dot) (?: do not capture [a-zA-Z0-9_'.-]{0,62} match to 62 characters, including dot [a-zA-Z0-9_'-] ending with a character, excluding dot )? zero or one time$ end of the string