Character class set operations?

diotalevi has asked for the wisdom of the Perl Monks concerning the following question:

I recall discussion of a feature in the regexp engine supporting set operations on character classes. I would like to use the character class [[:punct:]] minus [,"\s]. Isn't there a syntax to support that directly? I can't recall it and can't find documentation to support it. Whatever happened to that?

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Re: Character class set operations? (^..^) by tye (Sage) on Oct 23, 2007 at 03:32 UTC
`[^[:^punct:],"\s]` [download] Update: `[:punct:]` doesn't include any whitespace characters (in my testing) so your request to exclude `\s` and my `\s` are likely superfluous, FYI. - tye	[reply] [d/l] [select]
Re: Character class set operations? by ysth (Canon) on Oct 23, 2007 at 04:18 UTC
and the documentation is in perlre just after the list of character class names: You can negate the [::] character classes by prefixing the class name with a ’^’. This is a Perl extension.	[reply]