Python正则表达式模式以匹配xml字符串中的文本

Question

I'm parsing an XML file and need to remove some clutter from the final output.

str = <?xml version="1.0" encoding="UTF-8" standalone="yes"?><chat-message>2018-10

my attempt at a solution is:

re.sub(r'<(\w|\d|\s){1,}>{1,4}',"",str)

and my desired output is:

2018-10

Currently Python is finding no matches and just returning str . I don't think < or > are special characters so no escaping needed; I tried escaping anyway and it still did not work.

Answer 1

In my opinion you are better off using an XML parser rather than regex. Here is an example using xml.etree.ElementTree :

import xml.etree.ElementTree as ET

xmlstring = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?><chat-message>2018-10</chat-message>'
root = ET.fromstring(xmlstring)

print(root.text)
# OUTPUT
# 2018-10

Answer 2

您可以尝试一些更简单的方法：

re.sub(r'<.*?>', '', str)

Answer 3

This regex works for the test case in your question -

r"<[\w\D]+>([-\d]+)"

You can test it here -

https://regex101.com/