> Additionally: I'm not extremely surprised if other implementations mirror the details of the builtin glob as far as their behaviors go.

Tho I don't even know how to generate a test-suite for that.

It's mind-blowing

• alterations can be nested
• "nested" character classes do not exist but what are the exact escaping rules then?
• how do you test globing on filenames which a particular file-system doesn't allow °
• escaping of "glob-metas" must be reflected on "re-metas" and vice versa
• how do you test that no unintened re-meta was injected, without being escaped?
• I just noticed that Text::Glob translates {x,y} to (x|y) which means you get capture groups as a side effect.

There is more for sure ...

°) a quick test on Windows

  DB<152>  open my $fh ,">", "$_" or say "ERROR:'$_' $!"  for qw/~ [ ]
+ { } * ?/
ERROR:'*' Invalid argument
ERROR:'?' Invalid argument

  DB<153> x <?>
0  '['
1  ']'
2  '{'
3  '}'
4  '~'
  DB<154>
[download]

see also this SO answer: what-characters-are-forbidden-in-windows-and-linux-directory-names

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