181     protected $_string          = null;  variable in Hoa\\Ustring\\Ustring
241         $this->_string .= $substring;
254         $this->_string = $substring . $this->_string;
301             return strcmp($this->_string, (string) $string);
304         return $collator->compare($this->_string, $string);
377         $offset = strlen(mb_substr($this->_string, 0, $offset));
382                 $this->_string,
389         return preg_match($pattern, $this->_string, $matches, $flags, $offset);
406             $this->_string = preg_replace(
409                 $this->_string,
413             $this->_string = preg_replace_callback(
416                 $this->_string,
440             $this->_string,
453         return new \ArrayIterator(preg_split('#(?<!^)(?!$)#u', $this->_string));
463         $this->_string = mb_strtolower($this->_string);
475         $this->_string = mb_strtoupper($this->_string);
491         if (0 === preg_match('#[\x80-\xff]#', $this->_string)) {
495         $string  = $this->_string;
502             $this->_string = preg_replace_callback(
524             $this->_string = preg_replace('#(?:[\'"`^](\w))#u', '\1', $string);
531         $this->_string = static::transcode($string, 'UTF-8', 'ASCII//IGNORE//TRANSLIT');
556         $this->_string = $transliterator->transliterate($this->_string, $start, $end);
602         $this->_string    = preg_replace('#' . $handle . '#u', '', $this->_string);
616         $length = mb_strlen($this->_string);
639         return mb_substr($this->_string, $this->computeOffset($offset), 1);
655             $head = mb_substr($this->_string, 0, $offset);
658         $tail             = mb_substr($this->_string, $offset + 1);
659         $this->_string    = $head . $value . $tail;
695         $this->_string = mb_substr($this->_string, $start, $length);
707         return mb_strlen($this->_string);
718         $length = strlen($this->_string);
730         return $this->_string[$offset];
740         return strlen($this->_string);
752         return mb_strwidth($this->_string);
765             if (null === $this->_string) {
769                     mb_substr($this->_string, 0, 1)
1050         return $this->_string;