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I would like to ask you where I made a mistake. Why is there no "[b]php5[/b]" and "[b]php4[/b]" that I want?
/(\[[a-z]\])(\w*)(\[\/[a-z]\])/g
Thank you everyone, I wrote it down
/([[w]])(w*)([/[w]])/g Just finished writing, str.replace(re,function(str,$1,$2,$3){ return str;}) like this Write clearly
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Thank you everyone, I wrote it down
/([[w]])(w*)([/[w]])/g Just finished writing, str.replace(re,function(str,$1,$2,$3){ return str;}) like this Write clearly