note
Loops
<p>The <c>[A-Z0-9]</c> part of the expression matches any letter or any number. And it's followed by an asterisk "*", which means zero or more instances. So "1B3" and "K4R" both match at that point in the pattern.</p>
<p>To use upper case only, remove the trailing "i" from the initial $formget assignment.</p>
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