Hi

We are using web-forms where users can configure filters for various lists of strings.

I've convinced my colleagues to use globs instead of far to powerful regexes.

For that we are using Text::Glob which is internally translating Perl's glob syntax to a regex.

But I stumbled over an incompatibility while testing with character classes provided with [...] because an unpaired [ is not masked.

Demo:

  DB<84> x <[*>
0  '[KSR_3.pl'
  DB<85> $re = glob_to_regex( '[*' )
Unmatched [ in regex; marked by <-- HERE in m/^(?=[^\.])[ <-- HERE (?:
+(?!\/).)*$/ at c:/Strawberry/perl/vendor/lib/Text/Glob.pm line 18.

  DB<86> x $re_str = glob_to_regex_string( '[*' )
0  '(?=[^\\.])[(?:(?!\\/).)*'
  DB<87>

[download]

Point is that fileglob is automatically using the unpaired [ as a literal character, while Text::Glob is entering it as unescaped regex-meta which is causing a syntax error.

I'm not sure how to handle this best, an eval { glob_to_regex('[*') } will catch this particular input, but maybe not other broken code...

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Edge case in Text::Glob by LanX

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