1 “回顾”效果 我有一些使用的代码(looking-back … (line-beginning-position))。Doc字符串looking-back说明,由于速度慢,最好避免使用此功能。我很好奇以下方法会更快吗? (save-excursion (goto-char (line-beginning-position)) (looking-at regexp stuff)) 10 regular-expressions performance save-excursion