What are common pitfalls when using regular expressions in PHP, especially for beginners?

One common pitfall when using regular expressions in PHP, especially for beginners, is not properly escaping special characters. This can lead to unexpected behavior or errors in the regex pattern. To solve this issue, it's important to use PHP's built-in `preg_quote()` function to escape any special characters in the input string before using them in the regex pattern. 

$input_string = "Special characters: ^$.*";
$escaped_string = preg_quote($input_string, '/');
$pattern = '/^' . $escaped_string . '$/';

if (preg_match($pattern, $input)) {
    echo "Match found!";
} else {
    echo "No match found.";
}

Keywords

regex PHP beginners common mistakes error handling

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