File Upload Regularexpression - regex

Question

If someone knows please help me to build a regular expression that will valid
- no special characters allow in the file name
- only MS Word file can be uploaded (.docx,.doc, excel, ppt, etc)
- file name can not be more than 80 characters
Thanks

Answer 1

What language? Try this:
/^[A-Za-Z][A-Za-z0-9_ ]\.(docx|doc|xls|ppt|etc)$/
and then check length separately. You'll need to extend/edit the suffix list (etc is obviously not a legit suffix. :)

Answer 2

[a-z0-9A-Z-\s*]{1,80}\.(docx|doc|excel|ppt)
Add whatever file extensions you need seperated by |

Answer 3

All credits go to finalwesites.com, I've tweaked their demo file to fit your needs.
Live demo (without the tweak) at http://www.finalwebsites.com/demos/php_file_upload.php
<?php
require dirname(__FILE__).'/upload_class.php'; // Download it # http://pastebin.com/zAsn8V6R
$folder = dirname(__FILE__)."/upload/"; // "upload" is the folder for the uploaded files (you have to create this folder)
function select_files($dir) {
// removed in ver 1.01 the globals
$teller = 0;
if ($handle = opendir($dir)) {
$mydir = "<p>These are the files in the directory:</p>\n";
$mydir .= "<form name=\"form1\" method=\"post\" action=\"".$_SERVER['PHP_SELF']."\">\n";
$mydir .= " <select name=\"file_in_folder\">\n";
$mydir .= " <option value=\"\" selected>...\n";
while (false !== ($file = readdir($handle))) {
$files[] = $file;
}
closedir($handle);
sort($files);
foreach ($files as $val) {
if (is_file($dir.$val)) { // show only real files (ver. 1.01)
$mydir .= " <option value=\"".$val."\">";
$mydir .= (strlen($val) > 30) ? substr($val, 0, 30)."...\n" : $val."\n";
$teller++;
}
}
$mydir .= " </select>";
$mydir .= "<input type=\"submit\" name=\"download\" value=\"Download\">";
$mydir .= "</form>\n";
}
if ($teller == 0) {
echo "No files!";
} else {
echo $mydir;
}
}
if (isset($_POST['download'])) {
$fullPath = $folder.$_POST['file_in_folder'];
if ($fd = fopen ($fullPath, "rb")) {
$fsize = filesize($fullPath);
$path_parts = pathinfo($fullPath);
$ext = strtolower($path_parts["extension"]);
switch ($ext) {
case "pdf":
header("Content-type: application/pdf");
header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\"");
break;
case "docx":
header("Content-type: application/docx");
header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\"");
break;
case "doc":
header("Content-type: application/doc");
header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\"");
break;
case "xls":
header("Content-type: application/xls");
header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\"");
break;
case "ppt":
header("Content-type: application/ppt");
header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\"");
break;
case "txt":
header("Content-type: application/txt");
header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
break;
case "odt":
header("Content-type: application/odt");
header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
break;
default;
header("Content-type: application/octet-stream");
header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
}
header("Content-length: $fsize");
header("Cache-control: private");
while(!feof($fd)) {
$buffer = fread($fd, 2048);
echo $buffer;
}
}
fclose ($fd);
exit;
}
function del_file($file) {
$delete = #unlink($file);
clearstatcache();
if (#file_exists($file)) {
$filesys = eregi_replace("/","\\",$file);
$delete = #system("del $filesys");
clearstatcache();
if (#file_exists($file)) {
$delete = #chmod ($file, 0775);
$delete = #unlink($file);
$delete = #system("del $filesys");
}
}
}
function get_oldest_file($directory) {
if ($handle = opendir($directory)) {
while (false !== ($file = readdir($handle))) {
if (is_file($directory.$file)) { // add only files to the array (ver. 1.01)
$files[] = $file;
}
}
if (count($files) <= 12) {
return;
} else {
foreach ($files as $val) {
if (is_file($directory.$val)) {
$file_date[$val] = filemtime($directory.$val);
}
}
}
}
closedir($handle);
asort($file_date, SORT_NUMERIC);
reset($file_date);
$oldest = key($file_date);
return $oldest;
}
$max_size = 1024*2000; // the max. size for uploading = 2000 KB, change this to fit your needs
$my_upload = new file_upload;
$my_upload->upload_dir = $folder;
$my_upload->extensions = array(".docx", ".ppt", ".doc", ".pdf", ".xls", ".odt", ".txt"); // specify the allowed extensions here
if(isset($_POST['Submit'])) {
$my_upload->the_temp_file = $_FILES['upload']['tmp_name'];
$my_upload->the_file = $_FILES['upload']['name'];
$my_upload->http_error = $_FILES['upload']['error'];
$my_upload->replace = (isset($_POST['replace'])) ? $_POST['replace'] : "n";
$my_upload->do_filename_check = (isset($_POST['check'])) ? $_POST['check'] : "n";
if ($my_upload->upload()) {
$latest = get_oldest_file($folder);
del_file($folder.$latest);
}
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Demo: File upload/download and open directory</title>
<style type="text/css">
<!--
body {
font-family: Arial, Helvetica, sans-serif;
text-align:center;
}
p {
font-size: 14px;
line-height: 20px;
}
label {
font: 14px/20px Arial, Helvetica, sans-serif;
margin-top: 5px 0 0;
float:left;
display:block;
width:120px;
}
#main {
width:350px;
margin:0 auto;
padding:10px;
text-align:left;
border: 1px solid #000000;
}
input {
margin-left:5px;
}
-->
</style>
</head>
<body>
<div id="main">
<h2 style="text-align:center;margin-top:10px;">Demo page:</h2>
<p align="center">(File upload/download and open directory)</p>
<p>Max. filesize: <b><?php echo $max_size/1024; ?> KB</b><br>
<?php
$ext = "Allowed extensions are: <b>";
foreach ($my_upload->extensions as $val) {
$ext .= ltrim($val, ".").", ";
}
echo rtrim($ext, ", ")."</b>";
?>
</p>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" enctype="multipart/form-data" name="form1">
<input type="hidden" name="MAX_FILE_SIZE" value="<?php echo $max_size; ?>">
<center><input type="file" name="upload" id="upload" size="25"></center>
<label for="replace">Replace?</label>
<input type="checkbox" name="replace" id="replace" value="y"><br clear="all">
<label for="check">Validate filename ?</label>
<input name="check" type="checkbox" id="check" value="y" checked>
<br clear="all">
<center><input type="submit" name="Submit" id="Submit" value="Submit"></center>
</form>
<p style="margin-top:20px;color:#FF0000;"><?php echo $my_upload->show_error_string(); ?></p>
<?php echo select_files($folder); ?>
</div>
</body>
</html>