Thorsten Altenkirch - "Evaluating" Regular Expressions

See Thorsten Altenkirch - Defining Regular Expressions: he does something interesting to implement alt, I need to watch it again, ... 

Here's a problem: what does this expression match? 

I should try using Magma to generate the first few hundred words and see if it's anything obvious. See Numberphile - Sophie Maclean on the Catalan Numbers:

There's also something fishy going on in the eBPF. See this tweet of Richard Clegg's and  Buzzing Across Space - A Children's Guide to eBPF.

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