Re: Using regex to extract keys

[perlmonkey]

use grep:

my $r = 44;
my $hash = $self->{'residues'}{$modelCount};
for my $key ( grep { /^\w$r$/ } keys %$hash ) {
    print $key."\n";
}

Update:Yup, as abigail suggested use each for large hashes so you dont duplicate the memory needed for the keys:

my $r = 44;
my $hash = $self->{'residues'}{$modelCount};
while( my ($key, $value) = each %$hash ) {
    next if $key =~ /^\w$r$/;
    print $key."\n";
}

[Abigail-II]

Since the hash is given to be large, one might prefer iterating over the hash using each in a while loop. In the loop, test whether the key matches /^\w$r$/. If not, do a next.

Abigail

[seaver]

Fantastic, Thanks!

I was disappointed because I was hoping that there was some inherent regex in calling a hash key, but obviously I cant do it that way. The while loop with each does the job just grand.

Cheers
Sam