ICU doesn't consider these characters as punctuation (punct): $+<=>^`|~

The java.util.regex.Pattern documentation claims that the POSIX character class "Punct"

(\p{Punct})

contains the characters:

    !"#$%&'()*+,-./:;<=>?@[\]^_`{|}~

Empirically, the following characters are not considered in Punct on ICU.

   $+<=>^`|~

Grep seems to treat them as part of :punct:. So perhaps this is a bug in ICU? We need to figure out whether that is the case and how to fix it.

GoogleIssue: 111497078