TYPO3 Core

yes ; it returns the called host with HTTP_HOST (in comp. to SERVER_NAME which is the `apache` def.)

cat > public/test.php << EOL
<?php echo getenv('HTTP_HOST');flush();
EOL

Am "on the run" but a quick idea, did you try:

condition: 'applicationContext == "Production" && getenv("HTTP_HOST") matches "#de$#"'

the examples always use # as a delimiter, that might be enforced for the regexp....?

yea (tested) but regex does not care if / or #; first char will be last char (or error)

fyi/ switched the order @ languages: => `Resover` will pick the first entry BUT still "Reason: No site configuration found"
might be additional something "deeper" that even if found the domain is checked somewhere else again and error thrown ..

condition: 'getenv("HTTP_HOST") == "www.domain.com"'

btw/

applicationContext == "Production" && getenv("HTTP_HOST") ends with ".com"

Oh I just saw, you report this for TYPO3v11 which is out of support. Did you by chance try this with v12+?

I just set it up with my TYPO3 v12 and it works:

base: '/'
baseVariants:
  -
    base: 'https://build.demo.ddev.site/'
    condition: 'getenv("HTTP_HOST") == "build.demo.ddev.site"'
  -
    base: 'https://demo.ddev.site/'
    condition: 'getenv("HTTP_HOST") matches "#ddev.site$#" && getenv("HTTP_HOST") matches "#demo#"'
  -
    base: 'https://demo.domain.org'
    condition: 'applicationContext == "Production/Staging"'
  -
    base: 'https://www.domain.org'
    condition: 'applicationContext == "Production/Production"'

Maybe you can dig deeper and create a minimum "broken" configuration. Try with a fresh vanilla installation with just the bare, minimal site config and work from there...?

will upgrd. to 12 these days and check - thanks for your time and testing efford
may you try .. & check if https://demo.domain.org outputs www.domain.org

-    base: 'https://demo.domain.org'
-    condition: 'applicationContext == "Production/Staging"'
-  -
     base: 'https://www.domain.org'
-    condition: 'applicationContext == "Production/Production"'
+    condition: 'applicationContext == "Production/Production" && getenv("HTTP_HOST") matches "#\.org$#"'

Aaaah, now I think I understand what you try to do, you want to setup wildcard matching with a condition but only have one basevariant entry.

I must admit I'm not deep into the technical side of things, but in the projects I've been involved in, all possible URLs/domauins would need to be specifically listed with an exact matchin `base` entry.

So in your case:

title: Deutsch
    enabled: true
    languageId: 0
    base: /de/
    baseVariants:
      -
        base: 'https://domain.de/'
        condition: 'applicationContext == "Production" && getenv("HTTP_HOST") == "domain.de"'
      -
        base: 'https://www.domain.de/'
        condition: 'applicationContext == "Production" && getenv("HTTP_HOST") == "www.domain.de"'

Which would lead to duplicate content though. So I think you actually want to setup a routing that forwards fro www.domain.de to domain.de (or vice versa), which you could do completely outside of TYPO3 just with domain setup / htaccess. Or you could use the redirect module to setup a TYPO3-based redirection middleware step.

i want to get rid of the ReWrites to have domain-free .htaccess and less redirects

expl. idea .. not tested!

  RewriteCond %{ENV:TYPO3_CONTEXT} ^Production$
  RewriteCond %{HTTP_HOST} \.de$
  RewriteRule ^ /index.php?id=1&L=0 [END]

  RewriteCond %{ENV:TYPO3_CONTEXT} ^Production$
  RewriteCond %{HTTP_HOST} \.com$
  RewriteRule ^ /index.php?id=1&L=1 [END]

therefore thought that baseVariants would to the "tunnel" trick for presenting the correct `cannonical` for .de/.com without "www."

the idea ; use two domains w/o www. @ typo3 but also recognise www. with the same baseV. => will patch t3s'php internaly

fyi/ www. removing redirect .. https://stackoverflow.com/questions/60176153/#answer-60181749

RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} ^www\. [NC]
RewriteCond %{HTTP_HOST} ^(?:www\.)?(.+)$ [NC]
RewriteRule ^ https://%1%{REQUEST_URI} [R=301,L]

the additive counter version ..

RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^ https://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]