本文介绍了正则表达式匹配至少n个单词的句子的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试从PHP中至少包含5个单词的文本中提取所有句子.假设句子以句号，问号或感叹号结尾，我想到了:
I'm trying to pull all sentences from a text that consist of, say, at least 5 words in PHP. Assuming sentences end with full stop, question or exclamation mark, I came up with this:
/[\w]{5,*}[\.|\?|\!]/
任何想法，怎么了?
此外，要使用UTF-8，需要做些什么?
Also, what needs to be done for this to work with UTF-8?
推荐答案
\w仅匹配单个字符.一个单词是\w+.如果您至少需要5个字，则可以执行以下操作:
\w only matches a single character. A single word would be \w+. If you need at least 5 words, you could do something like:
/(\w+\s){4,}\w+[.?!]/
即至少4个单词，后跟空格，然后是另一个单词，再加上句子定界符.
i.e. at least 4 words followed by spaces, followed by another word followed by a sentence delimiter.
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