What best practices should be followed when using special characters in regular expressions in PHP?

When using special characters in regular expressions in PHP, it is important to properly escape those characters to avoid syntax errors or unexpected behavior. This can be achieved by using the preg_quote function to escape the special characters before using them in the regular expression pattern. 

$special_character = '*';
$escaped_character = preg_quote($special_character, '/');
$pattern = '/^' . $escaped_character . '.*$/';

Keywords

Regular expressions special characters PHP escape sequences preg_quote

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