AlphabeticFilter.php

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<?php
namespace TYPO3\CMS\Form\Filter;

class AlphabeticFilter implements \TYPO3\CMS\Form\Filter\FilterInterface {

    protected $allowWhiteSpace;

    public function __construct($arguments = array()) {
        $this->setAllowWhiteSpace($arguments['allowWhiteSpace']);
    }

    public function setAllowWhiteSpace($allowWhiteSpace = TRUE) {
        $this->allowWhiteSpace = (bool) $allowWhiteSpace;
    }

    public function filter($value) {
        $whiteSpace = $this->allowWhiteSpace ? '\\s' : '';
        $pattern = '/[^\pL' . $whiteSpace . ']/u';
        return preg_replace($pattern, '', (string) $value);
    }

}