According to RegEx101.com, the answer is no.
My sincere thanks to @Tom and @peternlewis for pursuing this subject so thoroughly.
Based on their posts, my research, and testing at RegEx101.com, it seems to me this is the best horizontal whitespace pattern that will work in all languages, including JavaScript:
[^\S\r\n\f]
2017-10-30 18:17 CT
If you are just working with the KM RegEx Actions, which all use the ICU RegEx engine, and your macOS is 10.11+, then clearly the best choice is:
\h (requires macOS 10.11+)
You can view my test case at: regex101: build, test, and debug regex
- The see how the pattern works with different languages, click on the language in the sidebar.
If anyone sees an issue using [^\S\r\n\f] for matching horizontal whitespace, please advise.