call_user_func_array returning unexpected results for regex

gistfile1.txt

public function validateResponses($check)
    {
        $count = 0;
        foreach ($check['responses'] as $response) {
            $validationErrors = array();
            foreach ($this->validateResponse as $field => $rules) {
                foreach ($rules as $rule) {
                    if (is_array($rule['rule'])) {
                        $func = $rule['rule'][0];
                        $args = array_slice($rule['rule'], 1);
                        $args = $args[0];
                    } else {
                        $func = $rule['rule'];
                        $args = null;
                    }
                    
                    if (method_exists($this, $func)) {
                        $valid = call_user_func_array(array($this, $func), array($response[$field], $args));
                        print_r($valid);
                    } else {
                        $valid = forward_static_call_array(array("VusionValidation", $func), array($response[$field], $args));
                    }
                    if (!is_bool($valid) || $valid == false) {
                       $validationErrors[$field][] = $rule['message']; 
                    }
                }
            }
            if ($validationErrors != array()) {
                $this->validationErrors['responses'][$count] = $validationErrors;
            }
            $count++;
        }
        if (isset($this->validationErrors['responses'])) {
            return false;
        }
        return true;
    }

gistfile2.txt

dynamic content validation function

public function validDynamicContent($check)
    {
        preg_match_all(VusionConst::DYNAMIC_CONTENT_MATCHER_REGEX, $check['content'], $matches, PREG_SET_ORDER);
        $allowed = array("domain", "key1", "key2", "otherkey");
        foreach($matches as $match) {
            $match = array_intersect_key($match, array_flip($allowed));
            foreach ($match as $key=>$value) {
                if (!preg_match(VusionConst::DYNAMIC_CONTENT_ALLOWED_REGEX, $value)) {
                    return __("To be used as dynamic content, '%s' can only be composed of letter(s), digit(s) and/or space(s).", $value);
                }
            }
            if (!preg_match(VusionConst::DYNAMIC_CONTENT_DOMAIN_REGEX, $match['domain'])) {
                return __("To be used as dynamic content, '%s' can only be either 'participant' or 'contentVariable'.", $match['domain']);
            }
            if ($match['domain'] == 'participant') {
                if (isset($match['key2'])) {
                    return __("To be used as dynamic concent, participant only accept one key.");
                }
            } else if ($match['domain'] == 'contentVariable') {
                if (isset($match['otherkey'])) {
                    return __("To be used as dynamic concent, contentVariable only accept max two keys.");
                }
            } 
        }
        return true;
    }