正则表达式匹配C风格的多行注释 [英] Regex to match a C-style multiline comment

问题描述

我有一个字符串，例如

String src = "How are things today /* this is comment *\*/ and is your code  /*\* this is another comment */ working?"

我想删除 / *这是评论* \ * / 和 / **这是来自 src 字符串的另一条评论* / 子字符串。

I want to remove /* this is comment *\*/ and /** this is another comment */ substrings from the src string.

我试图使用正则表达式但由于经验不足而失败。

I tried to use regex but failed due to less experience.

推荐答案

尝试使用此正则表达式（仅限单行注释）：

Try using this regex (Single line comments only):

String src ="How are things today /* this is comment */ and is your code /* this is another comment */ working?";
String result=src.replaceAll("/\\*.*?\\*/","");//single line comments
System.out.println(result);

REGEX解释：

字面匹配字符/

Match the character "/" literally

字面匹配字符*

。匹配任何单个字符

*？在零和无限次之间，尽可能少的时间，根据需要扩展
（懒惰）

"*?" Between zero and unlimited times, as few times as possible, expanding as needed (lazy)

匹配字符*字面上

匹配字符/字面意思

或者这里是单行和多行注释的正则表达式通过添加（？s）：

Alternatively here is regex for single and multi-line comments by adding (?s):

//note the added \n which wont work with previous regex
String src ="How are things today /* this\n is comment */ and is your code /* this is another comment */ working?";
String result=src.replaceAll("(?s)/\\*.*?\\*/","");
System.out.println(result);

参考：

• https://www.regular-expressions.info/examplesprogrammer .html

• https://www.regular-expressions.info/examplesprogrammer.html

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