字符串必须与7位数字和可选的非连续字符匹配

Question

I am trying to write a regex to match if it only contains [-+./()] and digits. The non digits must not have two consecutive matches. The string must also contain 7 digits in total.

ie

• (( is invalid.
• ( is also invalid
• (1234567)+ is valid and
• ()1+34564+0 is also valid

I've written this following regex: /^(([()/.+ -])\\1?(?!\\2)|\\d)*$/

The part that is not working for me is, the mandatory digits. I am not sure how to complete the the regex. How should the regex look for the above rules?

Answer 1

You could use a lookahead to validate the presence of 7 digits :

(?=\D*(\d\D*){7}$)

Placed at the beginning of your regex, it will make sure the matched String contains exactly 7 digits.

As a whole regex, I would use ^(?=\\D*(\\d\\D*){7}$)(?:(?:([-()+./])(?!\\2))|\\d)* . You can try it here .

Answer 2

我认为这可以做到：

^(?:(?:([-+./()])(?!\1))*\d){7}(?:([-+./()])(?!\2))*$