use v5.12.0;
use warnings;

# Check if key exist in hash but not exact match
# https://perlmonks.org/?node_id=11151448

my %prices =
  ("coke" => 1.25, "sandwich" => 3, "pizza" => 12);

my $concat = join $; => keys %prices;

for my $pat (qw/cok oke ok a/) {

    my @keys =
      $concat =~ m/([^$;]*${pat}[^$;]*)/g; 

    say "--- pattern: /$pat/";
    say "$_ => $prices{$_}"
      for @keys;
    say ".";
}