[单个字符](%E5%8D%95%E4%B8%AA%E5%AD%97%E7%AC%A6.md) [多个字符](%E5%A4%9A%E4%B8%AA%E5%AD%97%E7%AC%A6.md) [开头结尾](%E5%BC%80%E5%A4%B4%E7%BB%93%E5%B0%BE.md) [分组](%E5%88%86%E7%BB%84.md) [高级语法](%E9%AB%98%E7%BA%A7%E8%AF%AD%E6%B3%95.md)