我有如下所示的数据集
Id Comments
1 How. will the binary giant change.
Will the unknown disregard maximize another blamed bottle?
2 The thinking accent hurts.... How.. the lord coast?
3 The panda moans about the intuitive room past a device.
4 In an ideology punts the center..
How. An exercise elaborates past a photographic bookshop
我想保留包含关键字How
且不区分大小写的句子
最终数据集应如下所示
Id Comments
1 How will the binary giant change.
2 How the lord coast?
3 NA
4 How An exercise elaborates past a photographic bookshop
任何帮助深表感谢。