Parameters

• string $regex The regular expression to use.
• string $str The string to run the extraction on.
• integer $index The number of the part to return based on the regex.

Returns

Source

						public static function extract($regex, $str, $index = 0) {
		if (!preg_match($regex, $str, $match)) {
			return false;
		}
		return isset($match[$index]) ? $match[$index] : null;
	}