update   table1   set   text1=replace(text1,'list/任意位数的字符/','list/任意位数的字符/你好啊')    
    
  update   t   set   text1=reverse(stuff(reverse(text1)  
                                                                    ,charindex('.',reverse(text1))  
                                                                    ,0  
                                                                    ,reverse('list/任意位数的字符/你好啊')  
                                                                    )  
                                                        )