Inline latex doesn't allow punctuation following the ending $

[cventus]

Hi

When I try to include an inline equation I can't seem to put punctuation after the ending $. The following examples don't work unless I put a space before the period or comma:

The algorithm has a time complexity of $O(log(n))$.

Let's consider $x$, $y$, and $z$.

Putting a space in any of those locations really doesn't look good, and I think it's incorrect to include the punctuation in the equation itself.

I took a quick look at the regex and I wonder if it's possible to change the final look-ahead from (=?\s|$) to (=?\W|$). The non-word class \W includes spaces, but also common punctuation, which would resolve my issue.

marked-katex-extension/src/index.js

Line 4 in afea812

const inlineRule = /^(\${1,2})(?!\$)((?:\\.|[^\\\n])+?)(?<!\$)\1(?=\s|$)/;

[UziTech]

Ya I think that could work. Can you create a PR and add a couple tests?

[UziTech]

It looks like we would need to update the look ahead to (=?[^\w\}\$]|$)

This will prevent a match if one of the following are true:

• A word character is found \w since we don't want to match $300 $400
• A squiggly brace is found } since we want to be able to match nested katex $ \hbox{$x^2$} $
• A dollar sign $ since we want the same number of delimiters so it won't match $ not katex $$

I think this might be too lenient and allow other types of markdown that is not katex or prevent matching other valid katex.

The other alternative could be to list specific punctuation that we do allow (=?[\s.,]|$). This is how other parts of markdown work specifically adding valid punctuation.

I am also not an expert in katex so I don't know if there is a valid case of nested katex that would have punctuation after $

For example: (im not sure if this is valid katex)
$ some nested katex $x$, $

If we do decide to list valid punctuation, what punctuation should we allow?

[cventus]

Thanks for looking into this 👍 Good find about the autolink, I didn't consider that.

An explicit list of punctuation that's allowed, just like the autolink example, sounds like a better idea than the broad \W. I don't see why anybody would want to emphasize, bold, or strike-through an inline equation, and it probably wouldn't do what you want, so maybe keep ?, !, ., ,, and : and drop *, _ and ~? I.e. (=?[\s?!\.,:]|$)?

If this list is fine then I can create a PR with tests maybe today or tomorrow. The punctuation list can always be revised if there are any further issues.

[UziTech]

Ya that list works for me 👍