Are you parsing the content of a file or from the console log? Did you specify the encoding in the project configuration?

Parsing from console log.
In "Console output" (and the raw view) they display correctly as ‘ and ’.
The project configuration has no encoding options that I can see.

The option is in the advanced section of the warnings publisher.

Is the console always shown in UTF-8? Then I will always set the encoding to UTF-8 for the console (and ignore the setting in the configuration).

All Jenkins content is served with charset=UTF-8 in the Content-Type, so I guess that's a yes.

Hmm, I'm reading the actual file that is used to render the console log. This file seems to have no UTF-8 encoding header. Maybe that output depends on your build tool and can handle different encodings.

So I would prefer not to change the current behavior: you just need to set the encoding entry in the job configuration of the warnings plugin (the second last entry in the advanced section).

I would imagine it's globally set somewhere near the Winstone level. Everything that Jenkins serves is marked as UTF-8, including your plugin's output.
At minimum the default should be UTF-8, without having to go through every job config and set it manually.

Yes, that is correct: what Jenkins serves is UTF-8. But I'm reading the raw output of the build! And that output seems to be build related.

I think that I can try to switch to UTF-8 for the console log and see if others complain about that

Code changed in jenkins
User: Ulli Hafner
Path:
src/main/java/hudson/plugins/warnings/WarningsPublisher.java
http://jenkins-ci.org/commit/warnings-plugin/5934c43401b60d239f6a8820e15ee67be5c5afc7
Log:
[FIXED JENKINS-16929] Use UTF-8 encoding when parsing the console log.

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