Christian,
BBEdit reports the errors it meets while loading a Code Language Module in this log file:
~/Library/Containers/com.barebones.bbedit/Data/Library/Logs/BBEdit/Language\ Module\ Errors.log
and reports this error when loading your module:
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2022-01-25 12:22:01.693: Startup
The following problem(s) were encountered while loading the language module at ~/Library/Application Support/BBEdit/Language Modules/ArianeCodelessLanguageModule.plist:
The Skip Pattern was invalid (reference to non-existent subpattern (error 112115) at offset 7 in pattern).
The reported problems will prevent the language module from loading.
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I sent you offlist a working example.
For more info here is a link to BBEdit's Code Language Modules documentation :
https://www.barebones.com/support/develop/clm.htmlHTH
Jean Jourdain