Javascript Extract Comments RegExp

问题

I have a Javascript file like that

/**
 * My Comment Line1
 * My Comment Line2
 */
var a = 123;
/**
 * My Comment Line3
 * My Comment Line4
 */
var b = 456;

I am using node.js to read the file and want to extract comments in this file.

I use this regexp

/\/\*\*((?:\r|\n|.)*)\*\//

However this extracts

/**
 * My Comment Line1
 * My Comment Line2
 */
var a = 123;
/**
 * My Comment Line3
 * My Comment Line4
 */

My program have a loop to extract matched block one by one. So I want a RegExp to extract

First loop

/**
 * My Comment Line1
 * My Comment Line2
 */

Second loop

/**
 * My Comment Line3
 * My Comment Line4
 */

The rule is simply that comment block starts with /** and ends with */. Inside a comment, all characters are allowed.

Could anyone help me? Thanks!

回答1:

Try this : (it'll much ANY type of comments) - Live demo here : http://regexr.com?30jrh

(/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*+/)|(//.*)

Have a look :

回答2:

Here's a regular expression for that:

/\/\*\*(.|\n)+?\*\//

And here's a demo.

回答3:

The other answers did not quite work for me. Here's what did work, in Node.js, parsing Javascript.

/(\/\*([^*]|[\r\n]|(\*+([^*\/]|[\r\n])))*\*+\/)|(\/\/.*)/g

回答4:

/(\/\*).*?(\*\/)|(\/\/).*?(\n|\$)/s

Match opening and closing multiline tags and anything inbetween

(\/\*).*?(\*\/)

Or match a single line open comment that is terminated by a new or end of line

(\/\/).*?(\n|\$)

来源：https://stackoverflow.com/questions/10098738/javascript-extract-comments-regexp