$1';
// Italic
$pattern[1] = '/\[i\](.*?)\[\/i\]/is';
$replace[1] = '$1';
// Underlined
$pattern[2] = '/\[u\](.*?)\[\/u\]/is';
$replace[2] = '$1';
// Quote
$pattern[3] = '/\[quote\](.*?)\[\/quote]/is';
$replace[3] = '$1
';
// Code
$pattern[4] = '/\[code\](.*?)\[\/code\]/is';
$replace[4] = '$1';
// Strikethrough
$pattern[16] = '/\[s\](.*?)\[\/s\]/is';
$replace[16] = '$1';
// List Item
$pattern[7] = '/\[\*\]([\w\W]+?)\n?(?=(?:(?:\[\*\])|(?:\[\/list\])))/';
$replace[7] = '$1';
// List
$pattern[5] = '/\[list\](.*?)\[\/list\]/is';
$replace[5] = '';
// Ordered List
$pattern[6] = '/\[list\=(1|A|a|I|i)\](.*?)\[\/list\]/is';
$replace[6] = '$2
';
// Image
$pattern[8] = '/\[img\](.*?)\[\/img\]/is';
$replace[8] = '
';
// URL
$pattern[9] = '/\[url\](.*?)\[\/url\]/is';
$replace[9] = '$1';
// URL (named)
$pattern[10] = '/\[url\=([^\[]+?)\](.*?)\[\/url\]/is';
$replace[10] = '$2';
// Font Size
$pattern[11] = '/\[size\=([\-\+]?\d+)\](.*?)\[\/size\]/is';
$replace[11] = '$2';
// Font Color
$pattern[12] = '/\[color\=(#[0-9a-f]{3}|#[0-9a-f]{6}|[a-z\-]+)\](.*?)\[\/color\]/is';
$replace[12] = '$2';
// YouTube
$pattern[13] = '/\[youtube\](.*?)\[\/youtube\]/is';
$replace[13] = '';
$string = preg_replace($pattern, $replace, $string);
return $string;
}