These aren't the characters you're looking for...

[Dagfinn Ilmari Mannsåker]

Abigail <abigail at abigail.be> writes:

>
>> What does \h match?
>
> Horizontal whitespace, also new in 5.10. 19 characters in total,
> including often used characters like the mongolian vowel separator,
> the narrow no-break space, and the ogham space mark.

How about the zero-width no-break space?

-- 
ilmari
"A disappointingly low fraction of the human race is,
 at any given time, on fire." - Stig Sandbeck Mathisen