Question

任何人都可以提供有关以下正则表达式为何不起作用的指导吗？

project = 'AirPortFamily'
line = 'AirPortFamily-1425.9:'
if re.findall('%s-(\d+):'%project,line):
    print line

预期的输出：-

AirPortFamily-1425.9

Answer 1

您应该匹配可选的数字组，并在其前加上一个点：

tree /a /f > tree.txt

Answer 2

布兰登的答案看起来不错。

但是如果出现类似“要使标签有效，它必须以冒号（:)结尾”的条件，
为了解决该问题，请对布兰登的答案进行一些修改

project = 'AirPortFamily'
line = 'AirPortFamily-1425.9:'
matches = re.findall('%s-\d+\.+\d+\.*\d+:$'%project,line)
if matches:
    for elem in matches:
        print elem.split(':')[0]

这是它的工作

#Matching lines with colon(:) at the end
>>> import re
>>> project = 'AirPortFamily'
>>> line = 'AirPortFamily-1425.9:'
>>> matches = re.findall('%s-\d+\.+\d+\.*\d+:$'%project,line)
>>> if matches:
...     for elem in matches:
...             print elem.split(':')[0]
...
AirPortFamily-1425.9 #Look, the output is the way you want.

#Below snippet with same regex and different line content (without :) doesn't match it
>>> line = 'AirPortFamily-1425.9'
>>> matches = re.findall('%s-\d+\.+\d+\.*\d+:$'%project,line)
>>> if matches:
...     for elem in matches:
...             print elem.split(':')[0]
...
>>> #Here, no output means no match

Answer 3

您的正则表达式缺少。在第一组数字之后。这是一个工作示例：

project = 'AirPortFamily'
line = 'AirPortFamily-1425.9:'
matches = re.findall('%s-\d+\.\d+'%project,line)
if matches:
    print matches

Answer 4

这是我的正则表达式，my test on regex101 edit again

import re
project = 'AirPortFamily'
line = 'AirPortFamily-1425.9:AirPortfamily-14.5.9AirPortFamily-14.2.5.9:'
result = re.findall('%s[0-9.-]+:'%project,line) #this dose not cantain ':' [s[:-1] for s in re.findall('%s[0-9.-]+:'%project,line)]
if result:
    for each in result:
        print (each)

Answer 5

关于1.1.1.1.1的可能性，我得到了:，所以就从结果中删除它

if re.findall(r'%s-[\d+\.\d+]+:'%project,line):
    print(line.strip(':'))

(xenial)vash@localhost:~/python/stack_overflow$ python3.7 formats.py 
AirPortFamily-1425.9.1.1.1

为什么与项目标签匹配的正则表达式不起作用？

5 个答案: