A straightforward way to do this is write a wanted sub to search for the pattern, and if it matches append the current filename to an array.

Here's an example:

#!/usr/bin/perl

use warnings;
use strict;

use File::Find;
use FileHandle;

# Pattern is first argument;
# remaining arguments are file or directory names.
# Default directory is '.'

my $pat = shift;
my @results;

# Do the search
find(patternfinder(qr/$pat/,\@results),
     @ARGV?@ARGV:'.');

# Print the results
print join("\n",@results),"\n";

sub patternfinder
{
  # Generate a sub to search for a pattern and save the results
  my($pattern,$result) = @_;

  # Anonymous sub in a closure
  return sub {
    my $fh = new FileHandle $_, "r"
        or return warn "Couldn't open '$File::Find::name': $!\n";

    # Search for pattern, and add to array if it matches.
    while (<$fh>) {
      if (/$pattern/) {
        push(@$result,$File::Find::name);
        return;
      }
    }
    
    close($fh)
        or return warn "Couldn't close '$File::Find::name': $!\n";
  }
}
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