On Jul 23, Michael Fowler said:
>On Mon, Jul 23, 2001 at 04:53:28PM -0400, Jeff 'japhy/Marillion' Pinyan wrote:
>> Hopefully, in Perl 5.8 or Perl 6, there will be a much simpler character
>> class subtraction syntax:
>>
>> if ($name =~ /^[\w&&[^0-9_]]+$/) {
>> # valid
>> }
>
>I was under the impression the proposed syntax was:
>
> [\w[^0-9_]]+
Larry (Wall) didn't like the idea of merely an embedded notation: he
feels that using a double character (like &&) will strongly signify the
user's intent, for why a) double a character in a class, and b) right next
to itself?
The basic three operations are:
union: [[X][Y]]
intersection: [[X]&&[Y]]
subtraction: [[X]&&[^Y]]
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