I was trying to trim white spaces from all sides but allow the single spaces between the words typed?
I am using the following code:
if(!preg_match('/^[A-Za-z0-9_]+$/',$_POST['username'])){
if($stmt->execute()){
$_SESSION['notmet'] = "Invalid username. You can only use letters and/or digits";
header('location: index.php');}}
What am I exactly getting wrong here?