How can the \w character class in PHP regex patterns affect the validation of user input?

The \w character class in PHP regex patterns can affect the validation of user input by only allowing alphanumeric characters and underscores. If you want to allow other characters, such as spaces or special characters, you can modify the regex pattern to include those characters as well. 

// Example of using a modified regex pattern to allow spaces in user input validation
$userInput = "John Doe";

if (preg_match('/^[a-zA-Z\s]+$/', $userInput)) {
    echo "Input is valid.";
} else {
    echo "Input is invalid.";
}

Keywords

PHP regex patterns \w character class validation user input

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