Can I define show rules that apply to table headers (or first row) only?

Questions
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1

Is there a way to define a set of show rules (for example a bunch of regex search and replace) that would apply only to table headers? Or to the first row if we can’t access table headers?

2

Hi @bauble5078, thank you for your question! I have changed your post’s title to bring it in line with the question guidelines and thus make it easier to understand from the title:

Good titles are questions you would ask your friend about Typst.

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3

Hello @bauble5078, would the example at Table guide – Typst Documentation be what you were looking for?

#show table.cell.where(y: 0): strong

FYI, show rules on table.header do not work yet (I think).

It is best to wrap the header row of your table in the table.header function. This clarifies your intent and will also allow future versions of Typst to make the output more accessible to users with a screen reader

See Table guide – Typst Documentation

4

Thanks @quachpas, I indeed saw that section of the docs and was trying to adapt it to my case but I can’t figure it out… What I’m trying to do is to define a simple search and replace show rule that applies only to the first row of a table. Something like that, but restricted to row 0 of all tables:

#show regex("\<old\>"): [new]

Indeed, I also later read somewhere (can’t find the link back) that there is currently no API to access table.header() for this kind of things.

5

You can nest show rules:

#show table.cell.where(y: 0): it => {
  show regex("\<old\>"): [new]
  it
}
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