英文:
How does one match the file extension using re in python?
问题
我想匹配任何扩展名为 .Mp4 的文件。代码似乎不像我想象的那样工作...有什么线索吗？
import re
ext = r"\.Mp4$"
files = ["Good cool music yes.Mp4", "Very cool audio.mp3", "Top of the toppest.Mp4"]
for f in files:
if re.match(ext, f):
print(f)
else:
pass
英文:
I would like to match any file with .Mp4 extension. The code does not seem to work as I thought...Any leads??
import re
ext=r"\.Mp4$"
files = ["Good cool music yes.Mp4", "Very cool audio.mp3", "Top of the toppest.Mp4"]
for f in files:
if re.match(ext, f):
print(f)
else:
pass
答案1
得分: 1
我看到你正在使用re.match()，它仅检查字符串开头的匹配，而不管你传递的'$'标志如何。有关搜索与匹配的更多信息，请参阅https://docs.python.org/3/library/re.html#search-vs-match。
将你的代码更改为搜索将返回预期的结果：
import re
ext = r"\.mp4$"
files = ["Good cool music yes.Mp4", "Very cool audio.mp3", "Top of the toppest.Mp4"]
for f in files:
if re.search(ext, f, flags=re.I):
print(f)
else:
pass
英文:
I can see is that you are using re.match() which only checks the beginning of the string for matches regardless of the '$' flag you were passing. See https://docs.python.org/3/library/re.html#search-vs-match for more info on search vs match.
Changing your code to search returns the expected results:
import re
ext=r"\.mp4$"
files = ["Good cool music yes.Mp4", "Very cool audio.mp3", "Top of the toppest.Mp4"]
for f in files:
if re.search(ext, f, flags=re.I):
print(f)
else:
pass
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