Java正则表达式replaceAll多行 [英] Java regex replaceAll multiline

问题描述

我对多行字符串的replaceAll有问题:

I have a problem with the replaceAll for a multiline string:

String regex = "\\s*/\\*.*\\*/";
String testWorks = " /** this should be replaced **/ just text";
String testIllegal = " /** this should be replaced \n **/ just text";

testWorks.replaceAll(regex, "x"); 
testIllegal.replaceAll(regex, "x"); 

以上内容适用于testWorks，但不适用于testIllegal !? 为什么会这样，我该如何克服呢?我需要替换诸如注释/* ... */跨越多行的内容.

The above works for testWorks, but not for testIllegal!? Why is that and how can I overcome this? I need to replace something like a comment /* ... */ that spans multiple lines.

推荐答案

您需要使用Pattern.DOTALL标志说句点应与换行符匹配.例如

You need to use the Pattern.DOTALL flag to say that the dot should match newlines. e.g.

Pattern.compile(regex, Pattern.DOTALL).matcher(testIllegal).replaceAll("x")

或使用(?s)例如在模式中指定标志

or alternatively specify the flag in the pattern using (?s) e.g.

String regex = "(?s)\\s*/\\*.*\\*/";

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