PHP - Wha Is Alphanumeric?

I have a user input string via GET variable that I want to always make sure falls within the constraints of type of variable its set for, which is a md5 hash.
So I want to put together using preg_match or something using a regex construct (even though I suck with regex) to verify that all the characters in the string are valid characters for a md5 hash, where if its not then I want to kick back an error. The idea of making something like that isnt the issue for me so much as not knowing whether or not an md5 has is strictly alphanumeric or if it can possibly even if one in a million chance have something else from an underscore to a exclamation point or other characters. Ive tried to find out searching google and other sites for an answer but my search terms I guess are way to open to find something distinctly close to what I am looking for answer wise, so I figured I'd give you guys a shot see if anyone knows.

Hi

Looking to create an ID which only contains alpha-numeric (no special chars).

I looked to generate random bytes and then encode in base64 but base64 contains = + /.

The below seems to do it but not sure if bin2hex can return non alpha numeric?

bin2hex(openssl_random_pseudo_bytes(18));

 

Edited December 18, 2018 by mds1256

I am working on taking out the Deprecated functions from my site so while replacing ereg with preg_match I get the below error. Per a message I found on the internet it says to replace ereg with preg_match and everything should work. Can anyone assist me with fixing this error?

Error: Warning: preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash

Part where error is contained

if (preg_match('enum.(.*).', $row['Type'], $match)) {
    $opts = explode(',', $match[1]);
    foreach ($opts as $item)
        $finalResult[] = substr($item, 1, strlen($item)-2);
}


Full Function

function getEnumOptions($table, $field) {
   global $db;
   
   $finalResult = array();

   if (strlen(trim($table)) < 1)
    return false;
   
   $query  = "show columns from " . $db['tickets_slave']->escapeSimple($table);
   $res =& $db['tickets']->query($query);
   if (PEAR::isError($res)) {
throw new TixException($_SERVER['SCRIPT_NAME'] . ":", TixExceptionCodes::UNKNOWN_ERROR);
   } else {
try {
while ($res->fetchInto($row)) {
        if ($field != $row["Field"]) {
        
       } else {         
        //check if enum type
        if (preg_match('enum.(.*).', $row['Type'], $match)) {
            $opts = explode(',', $match[1]);
            foreach ($opts as $item)
                $finalResult[] = substr($item, 1, strlen($item)-2);
        }
       }
}
} catch (TixException $ex) {
throw new TixException($_SERVER['SCRIPT_NAME'] . ":", TixExceptionCodes::UNKNOWN_ERROR);
}
   }
   return $finalResult;
}

This topic has been moved to PHP Regex.

http://www.phpfreaks.com/forums/index.php?topic=356719.0

Jelly Bellys. So there are "recipes" of ones you can eat at the same time. The most well-known one is probably mixing a couple peanut butter jelly beans with a couple grapes. I have to say it's pretty good because they actually do taste like peanut butter and grapes, but I have one issue: the peanut butter flavor is too weak compared to the grape. Instead of a 1-1 ratio it takes more like 3-1.

Weird thing, this has got to be the most famous recipe so why isn't it listed on their site? I see candy apple, tiramisu, and lemon meringue pie, but nothing about peanut butter and jelly sandwiches. Are they just not popular anymore? Personally I prefer peanut butter and chocolate (Nutella, specifically) but whatever. Which can't be that weird because Reese's is popular... Mind you peanut butter + Nutella sandwiches don't really taste like Reese's candies, but that could just be because of the type of chocolate. Like they use milk or dark chocolate while Nutella is based on hazelnut.

Which reminds me, I have a jar of it in the cupboard, but it's been so long since I've used it that it might have turned into an oily mess by now. I know it's just the various oils and such separating but it looks like someone poured a teaspoon or two of water right into it and that just kinda puts me off the whole thing. Same for peanut butter for that matter except the "water" isn't clear. Dirty water. And mixing everything back together isn't so bad but it gets the knife dirty on the handle, which really bothers me because then my fingers get dirty and I have to stop what I'm doing and go wash my hands. I already do that enough each day, I don't want to make more reasons for me to do so.

But beyond the oily mess there's also stuff getting stale. Stale Nutella is a pain because it's stiff and hard to deal with, and the kind of bread I like most is very soft and easily rips apart so spreading it on can be a real labor. Best method I've found is to spread a little bit on at a time but it takes so long to cover the whole face. Fine, it's a good sandwich, but in that same time I could have done something else. Maybe there's something in the freezer I could quickly heat up, or maybe there's some leftovers in the fridge I could eat. And if not there's pretty good odds that I need to go to the grocery store anyways.

Ah, sorry. Forgot why I'm here.

This topic has been moved to MySQL Help.

http://www.phpfreaks.com/forums/index.php?topic=358112.0