At this point I already read the file in, is this looks ok based in what you have here? 
  for(my $i=0;$i<4;$i++) {
  
     my $file = $q->param('pic_'.$i);
     my @full = split(/(\\)|(\/)/,$file);
     my $filename = pop(@full);
        $filename =~ s/\n//;
        $filename =~ s/\r//;
        $filename = $username_pic."_".$filename;
        #$filename=~s/^([^_]+_)(.*)(\.\w{3})\z/$1.md5_hex($2).$3/eg;
        my $md5 = md5_hex( $filename );
        $filename =s[_(\d+).jpg$][_$md5.jpg];
}

[download]

In reply to Re^6: Renaming an image file by Anonymous Monk
in thread Renaming an image file by Anonymous Monk

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