edit：您可以为此使用以下正则表达式：

Based on your latest edit: You can use following regex for this:

^(?!.*?[^aeiou]{5})(?!.*?[aeiou]{3})[a-z]*$

在线演示： http://regex101.com/r/vM0aN9

分拆：

Online Demo: http://regex101.com/r/vM0aN9

Breaking it down:

• [^ aeiou] = >匹配任何东西，除了元音之外


• （？！*。[^ aeiou] {5}） =>没有5个连续辅音的情况


• （？！。*？[aeiou] {3}） =>没有连续3个元音的情况


• [az] * =>确保输入中只有字母
• 
  

• [^aeiou] => Match anything but vowels
• (?!.*?[^aeiou]{5}) => Negative lookahead to make sure there is no case of 5 consecutive consonants
• (?!.*?[aeiou]{3}) => To make sure there is no case of 3 consecutive vowels
• [a-z]* => To make sure there are only letters in the input