In neovim (v0.5.0), the regex \d matches any digit in the input string. The regex [0-9] does the same, but [\d] instead matches a literal d character, as seen in these images:
![[0-9]](https://i.imgur.com/GA0sI6T.png)
![[\d]](https://i.imgur.com/9ldOr5u.png)
Is it possible to use \d in a character range like that, or do I have to type [0-9]?
Inside a POSIX bracket expression ([...]), \d cannot be used to match digits.
However, inside a POSIX bracket expression, you can use POSIX character classes. Neovim supports quite a few, but in your case, you can use [:digit:]. So, to match either a comma or digits, you can use [,[:digit:]].
In Neovim, you can switch to an NFA regex engine that supports shorthand character classes inside square brackets.
Vim will automatically select the right engine for you. However, if you run into a problem or want to specifically select one engine or the other, you can prepend one of the following to the pattern:
\%#=0Force automatic selection. Only has an effect when
'regexpengine' has been set to a non-zero value.
\%#=1Force using the old engine.
\%#=2Force using the NFA engine.
So, you can use [\d] after you prepend the pattern with \%#=2.
