I thought the same. I think a nice name of the hash would be %~. =~ is matching so why couldn't $~{name} be a named match. Here is the code I ended up with:
...
sub convert
{
my $re = shift;
$re =~ s( \\ ( \\ | C\{ (?>\s*) ((?>\w+)) (?>\s*) \} ) )
{
defined $2
? "(?{\$~{$2}=\$^N})"
: "\\"
}xeg;
"(?{undef(%~)})" # clear the %~
.$re
."(?{\$~{\$_}=\${\$_} for(1..\$#+)})"; # add the numbered matches
}
...
my $re = qr/(\w+)\C{baz}(?: - (\w+)\C{qux})?(\+\d+)/;
"three - four - five+89" =~ $re;
print "baz=$~{baz}, qux=$~{qux}, $~{3}\n";
Please note that even the named matches got their number! Maybe they should not, I think I could implement that if I needed.
I also considered syntax like this:
my $re = qr/(?\$bar=\w+) - (?\$qux{not}=\w+)/;
which could naively be implemented like this:
...
sub convert
{
my $re = shift;
$re =~ s<\(\?\\\$([^=]+)=([^)]*)\)><($2)(?{\$$1=\$^N})>g;
$re
}
...
but the problem is that I don't know how to make sure you can do even things like :
my $re = qr/...(?\$var=a(\d+|\w-\w+)b).../;
I don't know how to find the right closing bracket.
Jenda
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Look around you, all you see are sympathetic eyes
Stroll around the grounds until you feel at home
-- P. Simon in Mrs. Robinson |
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