如何从字符串中使用定界符提取数字？

Question

I am trying to extract the numbers with delimiters from a filename (for version check purpose). I have the filename as filename= bacserv.v1.2.6 and not with quotes ('') . I am using RegEx as below but RegEx takes the input as 'bacserv.v1.2.6' with quotes. My expected output is 1.2.6 or "1.2.6" . Can anyone help?

import re
matches = re.findall('\d+', 'bacserv.v1.2.6')
print(matches)

Output:

['1', '2', '6']

Answer 1

use re.search with slightly different pattern:

import re
match = re.search('\d+.\d+.\d+', 'bacserv.v1.2.6')
if match:
   version = match.group()

Answer 2

您可以将正则表达式结果更进一步，然后应用'.'.join(matches)

Answer 3

How about the following? Assuming the version number always follows ".v" in the filename:

import re
m = re.search('(\.v)([\d\.]+)', 'bacserv.v1.2.6')
print(m.group(2))