From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michel Schinz <michel@schi.nz>
Subject: Re: including the | character in a table
Date: Wed, 25 Jul 2018 12:21:19 +0200
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Hello,

On Wed, Jul 25, 2018, at 11:22, Alan Schmitt wrote:
> I'm writing a cheat sheet for a programming language, and I'm having
> trouble with operators that use |. For instance:
> 
> | match expr with   | pattern matching |
> | | pattern -> expr | action           |
> 
> How can I escape the |? I tried putting a \ before but it does not work.

I've used macros in the past for such a case. Quite heavyweight, but I didn't find anything better. Here is an example (which you could augment if you wanted to export to LaTeX too):

#+MACRO: I @@html:&#124;@@

| match expr with        | pattern matching |
| {{{I}}}pattern -> expr | action           |

Michel.