@Dennis Update to my previous request: If you would upgrade PCRE2 to latest svn instead of just v10.34, this would now have R1197, which gives non-atomic lookarounds the golf-ready symbols (?*...) and (?<*...).
@Dennis May you add Microscript-II to TIO? I know nothing else about the language, you might have to figure out. I don't know whether Microscript has implicit output, so the Hello World might be "Hello, World!".