Why not simply allow a regular expression? More flexible and you don't have to write an ad hoc parser for it.

Why not simply allow a regular expression?

That would be fine for me too.

Why not simply allow a regular expression?

Importing the usage of regular expression may add some complexity and logic confilcts. For example, what will happen if some of section names are contradictory?

--NODE_DEBUG=fs,/^((?!fs).)*$/

The second regular expression matches the string not containing "fs", which is contradictory to the first argument.

Simple solution: don't write a broken regex. Garbage in, garbage out.

Closing in favor of #17609