DB<38> undef %x                         

  DB<39> @x{5..10} = ('a' .. 'z')[0..6]   

  DB<40> p join "\n", keys %x             
8
10
9
5
6
7
  DB<41> p join "\n", grep /a|b/, @x{5..7}
a
b
  DB<42> p join "\n", grep /a|b/, @x{1..10}
a
b
  DB<43> p join "\n", keys %x              
1
10
2
3
4
5
6
7
8
9
  DB<44> 

##</code><code>##

@my_values = @x{bigget_set_of_keys} ;
@my_filtered_vals = grep /Yeah hoo!/, @my_values ;