Why input 1 is not demo1
The regular pattern of demo1 limits demo1 to match {2,4}, that is, two to four digits
Which specific code. . . You posted it to take a look. In order to answer your question, you can't ask us to watch the video again. . .
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
The regular pattern of demo1 limits demo1 to match {2,4}, that is, two to four digits
Which specific code. . . You posted it to take a look. In order to answer your question, you can't ask us to watch the video again. . .