if(preg_match('(.*)^[A-Za-z0-9]+', $_POST['username']) !== 0) {
    echo "<p style=\"color:red;font-weight:bold;margin-left:95px\">";
    echo "Username must only contain A-Z and 0-9</p>";

I used the code above but I now get this error message

Warning: preg_match() [function.preg-match]: Unknown modifier '^' in 
C:\Documents and 
Settings\iceweasel\Desktop\XAMPP\relik.ath.cx\forum\register.php on line 2

I don't like to run php with errors off so I wanna ask how I can fix this.

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