UriValidator.php

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

class UriValidator extends \TYPO3\CMS\Form\Validation\AbstractValidator {

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_uri';

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            $value = $this->requestHandler->getByMethod($this->fieldName);
            if (!preg_match('/^(?#Protocol)(?:(?:ht|f)tp(?:s?)\\:\\/\\/|~\\/|\\/)?(?#Username:Password)(?:\\w+:\\w+@)?(?#Subdomains)(?:(?:[-\\w]+\\.)+(?#TopLevel Domains)(?:com|org|net|gov|mil|biz|info|mobi|name|aero|jobs|museum|travel|[a-z]{2}))(?#Port)(?::[\\d]{1,5})?(?#Directories)(?:(?:(?:\\/(?:[-\\w~!$+|.,=]|%[a-f\\d]{2})+)+|\\/)+|\\?|#)?(?#Query)(?:(?:\\?(?:[-\\w~!$+|.,*:]|%[a-f\\d{2}])+=?(?:[-\\w~!$+|.,*:=]|%[a-f\\d]{2})*)(?:&(?:[-\\w~!$+|.,*:]|%[a-f\\d{2}])+=?(?:[-\\w~!$+|.,*:=]|%[a-f\\d]{2})*)*)*(?#Anchor)(?:#(?:[-\\w~!$+|.,*:=]|%[a-f\\d]{2})*)?$/', $value)) {
                return FALSE;
            }
        }
        return TRUE;
    }

}