[匹配字符](%E5%8C%B9%E9%85%8D%E5%AD%97%E7%AC%A6.md) [匹配位置](%E5%8C%B9%E9%85%8D%E4%BD%8D%E7%BD%AE.md) [重复](%E9%87%8D%E5%A4%8D.md) [反义](%E5%8F%8D%E4%B9%89.md) [字符转义](%E5%AD%97%E7%AC%A6%E8%BD%AC%E4%B9%89.md)