fileglob is a glob library that uses gobwas/glob underneath and returns only matching files or direcories, depending on the configuration. Due to this great foundation, fileglob supports:

• Asterisk wildcards (*)
• Super-asterisk wildcards (**)
• Single symbol wildcards (?)
• Character list matchers with negation and ranges ([abc], [!abc], [a-c])
• Alternative matchers ({a,b})
• Nested globbing ({a,[bc]})
• Escapable wildcards (\{a\}/\* and fileglob.QuoteMeta(pattern))

By also building on top of fs.FS, a range of alternative filesystems as well as custom filesystems are supported.

gobwas/glob is very well implemented: it has a lexer, compiler, and all that, which seems like a better approach than most libraries do: regex.

It doesn't have a Walk method though, and we needed it in a couple of places. So we decided to implement it ourselves, a little bit based on how mattn/go-zglob works.