[TxMt] Perl language definition: switch, case?

[Michael Sheets]

On Feb 3, 2008, at 6:24 AM, Andy Armstrong wrote:

> I should have been more explicit. In Perl 5.10.0 // could be an  
> empty regex or the new 'defined or' operator:
>
> my $foo = $bar // 'not defined';	# new defined-or operator
> my @f = split //, $baz;			# empty regex

The relevant bit from the ruby grammar:

http://pastie.textmate.org/private/zuh0beeg1ciwdqbqlovmaa

Basically we define a list of items a regex can follow, anything else  
and it's a division operator. What you can do is the same expect only  
with empty regexes. Match // that follows words that regexes can  
follow, anything not caught will be caught by the lower // operator  
match. It's not perfect in Ruby but it's pretty close.