FreeKB - Perl Hash (grep keys)
Perl - Hash (grep keys)

Let's say you have the following hash. In this example, the hash has three keys (employee_key, id_key, department_key).

my %hash;
$hash{employee_key}   = "John Doe";
$hash{id_key}         = "123456";
$hash{department_key} = "Engineering";

 

grep can be used to only print certain keys. In this example, only id_key should be printed.

foreach my $key (keys %hash) {
  print grep (/id/, $keys);
}

 

Which should return the following.

id_key

 



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