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It's about implementing * as a wildcard character:

https://en.wikipedia.org/wiki/Globbing

I haven't figured out how to solve this with the parts of ERE and PCRE that I know. (I definitely don't know the entirety of PCRE.)

It's straightforward for me to write a substitution using regular expressions to create a pattern-matcher for a given glob (just anchor the ends and replace literal ? with . and literal * with .*) but here we have to do it inside a single regular expression.

I don't think there's a BRE solution if the number of stars is unbounded because I don't think this is a regular language.




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