sorting a list using regex

I am trying to sort a list by their first character, my problem comes when that first character is a number. When the character is a number I should be able to display just the values which begin with a number. When the value is a letter, I have no problem sorting this out. Here is the code that I am using to determine that, any help will be greatly appreciated. <? [snip] while(!feof($fp)) { $artist = fgetcsv($fp,128,":"); if(isset($_GET["sort"])) { if(($_GET["sort"] != substr(strtoupper($artist[0]),0,1)) || ($_GET["sort"] == "0-9" && !preg("^[0-9]",$artist[0]))) continue; } // do something here } [snip] ?> Running PHP 4.2.1 on IIS 5 W2K Thanks -josh