Question

我在python中有以下字符串s

ip access-list IpAclDscpTest
   10 permit ip any any dscp <value1>
   20 permit ip any any dscp <value2>
   30 permit ip any any dscp <value3>
   40 permit ip any any dscp <value4>
   50 permit ip any any dscp <value5

值LT; 1-5＆GT;可以是数字或字符串，如'abc31'

例如

txt = '''ip access-list IpAclDscpTest
   10 permit ip any any dscp 0
   20 permit ip any any dscp af31
   30 permit ip any any dscp ef
   40 permit ip any any dscp 34
   50 permit ip any any dscp 46'''

有没有办法在dscp之后过滤掉这些值并使用正则表达式将它们放入列表中？

Answer 1

这就是我要做的，这是对其他答案的一点改进：

import re

txt = '''ip access-list IpAclDscpTest
   10 permit ip any any dscp 0
   20 permit ip any any dscp af31
   30 permit ip any any dscp ef
   40 permit ip any any dscp 34
   50 permit ip any any dscp 46'''

regex = r'''dscp\s+ # matches dscp and one or more spaces
            ([a-z0-9]+) # capture group, one or more lowercase alphanumerics
             \s*  # matches possible spaces after (0+)
              $ # this matches every endline (with MULTILINE flag below)
         '''

number_list = re.findall(regex, txt, re.MULTILINE | re.VERBOSE)

和number_list会给您回复：

['0', 'af31', 'ef', '34', '46']

Answer 2

试试这个新问题。

ouput = re.findall(r'dscp\s+(.*)\s+',s)

Answer 3

让前贪婪

#!/usr/bin/python

input="""
ip access-list IpAclDscpTest
   10 permit ip any any dscp 0
   20 permit ip any any dscp 12
   30 permit ip any any dscp 18
   40 permit ip any any dscp 34
   50 permit ip any any dscp 46
"""

import re

for v in re.findall('.*dscp\s(\d+)', input):
    print v

使用正则表达式过滤字符串后的值

3 个答案: