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Out of experience which is better to use
filter_input(INPUT_GET, ‘my_string’, FILTER_SANITIZE_STRING);
Or a regular expression preg_match for sanitizing user in-putted data ?
It depends on what you want to do and which PHP version you’re using.
filter_input is a convenient method to validate some input data for a well known target format such as URLs, IP-addresses or eMail-addresses, but might only be available for PHP >= 5.2.
In order to validate custom data (e.g. comma-separated values string), a regular expression would be more appropriate and therefore the way to go.