class StringConstraint

class StringConstraint extends Constraint {
    
    /**
     * {@inheritdoc}
     */
    public function check(&$element, $schema = null, ?JsonPointer $path = null, $i = null) {
        // Verify maxLength
        if (isset($schema->maxLength) && $this->strlen($element) > $schema->maxLength) {
            $this->addError($path, 'Must be at most ' . $schema->maxLength . ' characters long', 'maxLength', array(
                'maxLength' => $schema->maxLength,
            ));
        }
        
        //verify minLength
        if (isset($schema->minLength) && $this->strlen($element) < $schema->minLength) {
            $this->addError($path, 'Must be at least ' . $schema->minLength . ' characters long', 'minLength', array(
                'minLength' => $schema->minLength,
            ));
        }
        // Verify a regex pattern
        if (isset($schema->pattern) && !preg_match('#' . str_replace('#', '\\#', $schema->pattern) . '#u', $element)) {
            $this->addError($path, 'Does not match the regex pattern ' . $schema->pattern, 'pattern', array(
                'pattern' => $schema->pattern,
            ));
        }
        $this->checkFormat($element, $schema, $path, $i);
    }
    private function strlen($string) {
        if (extension_loaded('mbstring')) {
            return mb_strlen($string, mb_detect_encoding($string));
        }
        // mbstring is present on all test platforms, so strlen() can be ignored for coverage
        return strlen($string);
        // @codeCoverageIgnore
    }

}