Python正则表达式如何删除以 - 开头并以逗号结尾的句子末尾的字符串？

Question

我有像这样的字符串

docs = ["This is blue -Gary,.", "Let's go swim. Sounds good -Mark,",
         "How are you? Mark says yes. Let's go - Grant,"]

如果它在最后一句中以及在“-”和“”之间，我想删除该名称，但我不知道该怎么做。

期望的输出

docs = ["This is blue", "Let's go swim. Sounds good",
             "How are you? Mark says yes. Let's go"]

我努力了

re.sub(r'_^\b.*?[,]\s+', '', x))

但这无济于事。

Answer 1

您可以使用

\s*-\s*[^\W\d_]+,(?=\.?$)

请参阅正则表达式演示。 详情：

• \s*-\s* - 用零个或多个空格括起来的连字符
• [^\W\d_]+ - 一个或多个字母
• , - 逗号
• (?=\.?$) - 一个正向的前瞻，它需要一个可选的点和字符串位置的结尾紧靠当前位置的右侧。

查看 Python 演示：

import re
rx = re.compile( r'\s*-\s*[^\W\d_]+,(?=\.?$)' )
docs = ["This is blue -Gary,.", "Let's go swim. Sounds good -Mark,",
         "How are you? Mark says yes. Let's go - Grant,"]
print( [rx.sub('', x) for x in docs] )

输出：

['This is blue.', "Let's go swim. Sounds good", "How are you? Mark says yes. Let's go"]