* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Form\Util; /** * @author Issei Murasawa * @author Bernhard Schussek */ class StringUtil { /** * This class should not be instantiated. */ private function __construct() { } /** * Returns the trimmed data. * * @return string */ public static function trim(string $string) { if (null !== $result = @preg_replace('/^[\pZ\p{Cc}\p{Cf}]+|[\pZ\p{Cc}\p{Cf}]+$/u', '', $string)) { return $result; } return trim($string); } /** * Converts a fully-qualified class name to a block prefix. * * @param string $fqcn The fully-qualified class name * * @return string|null */ public static function fqcnToBlockPrefix(string $fqcn) { // Non-greedy ("+?") to match "type" suffix, if present if (preg_match('~([^\\\\]+?)(type)?$~i', $fqcn, $matches)) { return strtolower(preg_replace(['/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'], ['\\1_\\2', '\\1_\\2'], $matches[1])); } return null; } }