Chinese literature database 中文文学作品资料库
The database of the Center for Chinese Linguistics PKU
It supports modern and ancient Chinese, context-view.
Pattern search examples:

    爱(V,=2)不(V) will get 爱执行不执行, 2 characters following 爱, then 不 and max 10(default) characters.
    
    爱(V,2-5)不(V), 2 to 5 characters following 爱,
    
    爱(V,&lt;5)不(V)
    
    有(V,&lt;8)没(V,&gt;7) wrong, only support 1 condition


It has many other features, described in the documentation.