What alternative approach could the forum user take to handle punctuation marks in the input string?

The forum user could use regular expressions to remove all punctuation marks from the input string. This can be achieved by using the `preg_replace` function in PHP with a regular expression pattern that matches all punctuation marks. By doing this, the user can ensure that the input string contains only alphanumeric characters. 

// Remove all punctuation marks from the input string
$inputString = "Hello, World! How are you?";
$cleanString = preg_replace('/[^\p{L}\p{N}\s]/u', '', $inputString);

echo $cleanString; // Output: Hello World How are you

Keywords

htmlspecialchars htmlentities regex string manipulation input validation

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