getting a regex to return an array of matches?

rmexico has asked for the wisdom of the Perl Monks concerning the following question:

is there a way to get a regex to return an array of instances? for ex.

undef $/;
open INFILE, "<$file";
my @filecontents = <INFILE>;
close INFILE;
foreach my $filepieces (@filecontents) {
  if ($filepieces =~ /SOME_REGEX/smg) {
    # do something w/ match
  }
[download]

BUT --- what if that regex occurs more than once in the file? it'll match and stop at that instance. how do i get to more occurrances of what i'm hunting for if i'm slurping the whole file into a variable?

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