[（1）創建正則](%EF%BC%881%EF%BC%89%E5%88%9B%E5%BB%BA%E6%AD%A3%E5%88%99.md) [（2）字符串中支持正則](%EF%BC%882%EF%BC%89%E5%AD%97%E7%AC%A6%E4%B8%B2%E4%B8%AD%E6%94%AF%E6%8C%81%E6%AD%A3%E5%88%99.md) [（3）語法](%EF%BC%883%EF%BC%89%E5%A4%87%E9%80%89%E5%AD%97%E7%AC%A6.md) [最核心的元字符](%E6%9C%80%E6%A0%B8%E5%BF%83%E7%9A%84%E5%85%83%E5%AD%97%E7%AC%A6.md)