hello everyone i have a question about a program i have tried to write, i am a beginner to programming overall, and i am having much trouble with everything,including syntax errors and the like, but in this case,none are reported, even when using -w , it is a basic random password generator i tried to create for myself,as you can see,i am using the urandom file that is included with linux, the matching does not work, no matter what i put inbetween the m// function,it will push every character into the array, while i only want it to push 0-9 and a-z,i tried manually specifying /55-90/ also with a backslash /\55-90/ (can't use the [] parenthesis since it creates links,but in my program i have it) and just to try,i tried using the defined \w switch ,and nothing works.. thank you in advance for you reply 
#!/usr/bin/perl -w
$DEBUG=1;
#this is my random password generator project
open(FILE ,"/dev/urandom") or die "could not open the file: $!";
$index=0;
print "how many characters in length should the password be?\n";
$input=<STDIN>;
chomp($input);
while($index < $input)
{
  $character=getc FILE;
  chomp($character);
  print "### DEBUG: \$character is $character\n" if $DEBUG;  
  if(chr $character =~ m/[55-90]/)
    {
    push(@array ,$character);
        $index++;    
    }
}
print reverse(@array);
close FILE;

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UPDATE:I was making quite the bad mistakes i see.. i did check the documentation, but unfortunately i didnt grasp it too well, its just that i'm only about 2 weeks into programming and all of this still hurts my head a little.. i will learn, thank you all very much for your replies

20050209 Edit by castaway: Changed title from 'Why won't this program work?'

In reply to Matching alphanumeric characters from urandom by Garanixx

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