Is it possible to escape and keep the nonstandard | character as is in an URL in a template Wiki Markup within a table?
{| class="wikitable"
|-
! Test in Table
|-
| [http://example.org/{var1}|{var2}|{var3} Example]
|}
Should render something like this in the table cell
[http://example.org/1|2|3 Example]
and link to
http://example.org/1|2|3
with the vertical bars as is and not encoded like this
http://example.org/1%7C2%7C3
The 3rd party website requires «|» in the URL, I would fix the URL handling on the server side but that is out of my hands for now. Any help on a workaround?
I tried these:
[http://example.org/1|2|3 Example] doesn't work within a table
[http://example.org/{var1}|{var2}|{var3} Example] works in tables
but both create valid standard URLs where the vertical bar is properly URL encoded as %7C like above which I would like to prevent.
External links, without support from additional extensions, can only be produced by the [url description] syntax or a plain URL itself.
Although as mentioned by skalee, you can use {{!}} or other methods to prevent the pipe symbol from being interpreted as part of the Wikitext syntax, the final link will always be encoded.
Without help from extensions, a quick solution would be JavaScript. (If it is on your own MediaWiki site, that would be very simple. MediaWiki:Common.js contains JavaScript that will be loaded for all users).