如何用正则表达式匹配英文文章中的英文单词？谢谢^_^

Question

### 题目描述
需求：Java写一个程序，汇总文章中每个英文单词的个数。判断一个单词时，需要考虑前后的空格，换行字符以及连接”-”符号，连接符会将一个词组成一个整体，用正则表达式实现，具体规则如下：
1. 以下当作一个词: 
don't, doesn't, didn't, can't, couldn't, wouldn't, isn't, aren't, wasn't, weren't     
2. 以下当作一个词处理: 
he's, she's, I'm, you're, we're, they're    
3. 以下不计入统计，删除
Shawn's, apple's, Jonas’, what's, 'twas
4. ice-cream    如果不在行尾换行时，当作一个词,但是不能删掉中间连接符

### 题目来源及自己的思路
看了一些资料，写了一个初稿，
(?:she's|he's|they're|we're|you're|I'm|It's)|(?:isn't|aren't|doesn't|don't|didn't|haven't|hadn't|hasn't|can't|couldn't|wasn't|weren't|wouldn't )

测试字符串为：
She's"1.tom:'what's your name.'  Jame's Janes', didn't, character,wasn't,
ice-cream, 

### 相关代码
(?:she's|he's|they're|we're|you're|I'm|It's)|(?:isn't|aren't|doesn't|don't|didn't|haven't|hadn't|hasn't|can't|couldn't|wasn't|weren't|wouldn't )

### 你期待的结果是什么？实际看到的错误信息又是什么？
但是不能正确判断单词、连接符和换行符。

谢谢老司机领路！帮我设计这个正则表达式 ^_^

Answer 1

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