Having trouble with ereg()

Kinsbane

So I have this great book, Professional PHP Programming that's helping me out a lot. However, I just can't wrap my head around regular expressions and trying to search a string for certain characters.

I've got a file upload field, and what i need my function to do is not let anyone upload a file that contains characters other than 0-9 and a-z. no spaces, no punctuation, no special characters. 0-9 and a-z only. What's the simplest way for this?

LordShryku

[man]ctype_alnum[/man]

Kinsbane

Originally posted by LordShryku
[man]ctype_alnum[/man]

Once again, you are my savior! 🙂

Kinsbane

Originally posted by LordShryku
[man]ctype_alnum[/man]

So I tried doing that, but it's still not letting me upload a file that contained what I thought to be a correct filename.

The reason is - I assigned the $_FILES['file1']['name'] to a variable called $filename. Now, $filename contains the string "file.doc" and ctype_alnum looks at this string, sees the period, and says "false".

How can I get around this?

Sco_________

<?
$filename=str_replace(".","","".$_FILES['file']['name']."");

If(!ctype_alnum($filename)) {

Exit("Invalid");

} Else {

// Valid

}
?>

LordShryku

if(eregi("[^0-9a-z.]", $filename)) {
   // Invalid
}

Sco_________

That would allow periods though..

LordShryku

Yes, which is what I assume he wants to do.

Kinsbane

Originally posted by LordShryku
if(eregi("[^0-9a-z.]", $filename)) {
   // Invalid
}
[/B]

Great! Thank you again!