Java - 正则表达式 - 删除评论 [英] Java - Regex - Remove comments

问题描述

我想删除Java代码中的注释。我看过很多例子，但每个都写错了。

以下是代码示例：

  String somestring =http://google.com; ////google.com;将被删除
  

另一个例子：

  get.setHeader（Accept，* / *）; /// *）;以后将被删除
  

但我想要正确的正则表达式来处理这些情况

我试过：

如果我们然后用第一个捕获组替换每个匹配，那么每个匹配都没有捕获组（即a评论）已删除：

Regex101替代演示

我所采用的更为通用的匹配条件a | b | c -technique的说明此处。

I want to remove comments in Java code. I have seen a lot of examples, but each was written wrong.

Here is example of code:

String somestring = "http://google.com"; // "//google.com";" is going to be removed

Another example:

    get.setHeader("Accept", "*/*"); // "/*");" and later is going to be removed too

But I want right regular expression which handles those cases

I tried: http://ostermiller.org/findcomment.html Regular expression to remove comment and other popular examples

It should handle common cases:

somemethod();//it should be removed
somemethod(); /* some comment that may end on other line */

But should be handled and other situations:

String somestring = "http://google.com"; // url shouldn't be touched
get.setHeader("Accept", "*/*"); // "*/*" shouldn't be touched too

解决方案

Already commented this but lets see how far we get. Java doesn't do regex literals so stripping that one from this answer we get the following regex:

((['"])(?:(?!\2|\\).|\\.)*\2)|\/\/[^\n]*|\/\*(?:[^*]|\*(?!\/))*\*\/

Debuggex Demo

If we then "replace" every match with the first capture group, every match that doesn't have a capture group to begin with (i.e. a comment) is removed:

Regex101 substitution Demo

A explanation of the more generic "match this except in conditions a|b|c"-technique I employed is available here.

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