带有子域的 URL 正则表达式

Question

I am trying to build a regular expression for domains + subdomains. Unfortunately, I did not manage to define it.

I've built a regex for a regular domain.

/^[a-zA-Z0-9]{1,}[-]{0,}[a-zA-Z0-9]{1,}.([a-zA-Z0-9].){2,}(com|co.il|org|co|net|info|biz|org.il|io)$/

I want that the user could enter text and dot (ex: "web.") as many times as he wants but it won't be required also if the user adds another dot, he will be required to add letters / numbers before so it will be a valid sub domain

Answer 1

尝试以下正则表达式：

/^([a-zA-Z0-9][a-zA-Z0-9-_]*\.)*[a-zA-Z0-9]*[a-zA-Z0-9-_]*[[a-zA-Z0-9]+$/