1766 	var $abbr_word_re = '';  variable in MarkdownExtra_Parser
1783 		$this->abbr_word_re = '';
1787 			if ($this->abbr_word_re)
1788 				$this->abbr_word_re .= '|';
1789 			$this->abbr_word_re .= preg_quote($abbr_word);
1803 		$this->abbr_word_re = '';
3219 		if ($this->abbr_word_re)
3220 			$this->abbr_word_re .= '|';
3221 		$this->abbr_word_re .= preg_quote($abbr_word);
3231 		if ($this->abbr_word_re) {
3236 				'(?:'.$this->abbr_word_re.')'.