What are best practices for escaping special characters in regular expressions in PHP?

Special characters in regular expressions need to be escaped to be treated as literal characters. In PHP, you can use the preg_quote() function to automatically escape special characters in a given string before using it in a regular expression pattern. 

$pattern = "/^" . preg_quote($input, '/') . "$/";

Keywords

regular expressions special characters escaping PHP security

Related Questions