[@_ck_ Participant 15 years, 5 months ago]

CyrNickName is virtually identical to the function linked above, they all take the same approach:

function sanitize_user_cyr( $raw_username, $username, $strict = false ) {

$raw_username = $username;



$username = strip_tags($username);

// Kill octets

$username = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '', $username);

$username = preg_replace('/&.+?;/', '', $username); // Kill entities



// If strict, reduce to ASCII for max portability.

//	if ( $strict )

//		$username = preg_replace('|[^a-z0-9 _.-@]|i', '', $username);



return apply_filters('sanitize_user_cyr', $username, $raw_username, $strict);

}



add_action('sanitize_user', 'sanitize_user_cyr', 0, 3);