public static Unicode::caseFlip($matches) Flip

public static Unicode::substr($text, $start, $length = NULL)

public static Unicode::strtolower($text) Converts

public static Unicode::validateUtf8($text) Checks

Indicates an error during check for PHP unicode support. File core/lib/Drupal/Component/Utility/Unicode

public static Unicode::check() Checks for

public static Unicode::strlen($text) Counts

public static Unicode::strtoupper($text) Converts

public static Unicode::mimeHeaderEncode($string) Encodes

public static Unicode::ucfirst($text) Capitalizes