查找未知子與正則表達式其他已知的（但可選）字符串之間的Java

Question

我需要找到一個地方的名稱（聖安東尼奧的例子，但可以不管）在這種字符串

1. 天氣怎麼在聖安東尼奧
2. 會有什麼天氣在聖安東尼奧的明天
3. 會是怎樣的天氣，明天在聖安東尼奧

這個JAVA正則表達式：

(What's|What is|What will be) the weather(tomorrow)?(in (\D*))? 

我得到分別爲：

1. 開始（）= 0，結束（）= 33

   group(0) = "What's the weather in San Antonio" 
   
   group(1) = "What's" 
   
   group(2) = "null" 
   
   group(3) = " in San Antonio" 
   
   group(4) = "San Antonio" 
   

2. 開始（）= 0，結束（）= 48

   group(0) = "What will be the weather in San Antonio tomorrow" 
   
   group(1) = "What will be" 
   
   group(2) = "null" 
   
   group(3) = " in San Antonio tomorrow" 
   
   group(4) = "San Antonio tomorrow" 
   

3. start（）= 0，end（）= 48

   group(0) = "What will be the weather tomorrow in San Antonio" 
   
   group(1) = "What will be" 
   
   group(2) = " tomorrow" 
   
   group(3) = " in San Antonio" 
   
   group(4) = "San Antonio" 
   

如果句子與城市名稱本身的問題可以很容易地固定總是能完成，我期待已久「的」字和仍然是城市的名稱。 但問題是，在句子2中我無法理解「明天」是否存在以及如何將其從城市名稱組中刪除。

對於正則表達式測試我使用這個頁面

http://www.cis.upenn.edu/~matuszek/General/RegexTester/regex-tester.html

感謝您的幫助。

Answer 1

下應該爲所有的測試串的工作：

(What's|What is|What will be) the weather(tomorrow)?(in (\D*?)(tomorrow)?$)? 

新結果（第4組永遠是城市）：

1. 是什麼在聖安東尼奧

   天氣

   start() = 0, end() = 33 
   group(0) = "What's the weather in San Antonio" 
   group(1) = "What's" 
   group(2) = "null" 
   group(3) = " in San Antonio" 
   group(4) = "San Antonio" 
   group(5) = "null" 
   

2. 明天聖安東尼奧天氣怎麼樣

   start() = 0, end() = 48 
   group(0) = "What will be the weather in San Antonio tomorrow" 
   group(1) = "What will be" 
   group(2) = "null" 
   group(3) = " in San Antonio tomorrow" 
   group(4) = "San Antonio" 
   group(5) = " tomorrow" 
   

3. 什麼將是明天的天氣在聖安東尼奧

   start() = 0, end() = 48 
   group(0) = "What will be the weather tomorrow in San Antonio" 
   group(1) = "What will be" 
   group(2) = " tomorrow" 
   group(3) = " in San Antonio" 
   group(4) = "San Antonio" 
   group(5) = "null"