I am trying to grab an ip address
from a string and facing an issue.please help.
inet addr:11.11.11.11 Bcast:11.11.11.111 Mask:111.111.11.1
.
This is the string I have and I need ip address next to addr:
I have tried the following code and failed to do in python:
ip = re.findall(r'(?:\\d{1,3}\\.)+(?:\\d{1,3})', line)
and get index 0 item.
Result : This is actually giving me nothing in return
Your REGEX could be more specific, I think you could use something like :
addr:(?<ip>\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})
In python:
match = re.match(r'addr:(?<ip>\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})', line)
You can then access the ip
group by calling match.group('ip')
.
I noted that your regex will match invalid IPv4 addresses.
import re
string = 'inet addr:300.11.11.11 Bcast:11.11.11.111 Mask:111.111.11.1'
# your pattern
ip_address_pattern = re.compile(r'(?:\d{1,3}\.)+(?:\d{1,3})')
find_ip_address = re.findall(ip_address_pattern, string)
if find_ip_address:
print (find_ip_address)
# outputs
['300.11.11.11', '11.11.11.111', '111.111.11.1']
I have used this IPv4_format in the past to extract valid IPv4 addresses.
import re
string = 'inet addr:11.11.11.11 Bcast:11.11.11.111 Mask:111.111.11.1'
# Valid IPv4 address format
ip_address_pattern = re.compile(r'\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b')
find_ip_address = re.findall(ip_address_pattern, string)
if find_ip_address:
print (find_ip_address)
# outputs
['11.11.11.11', '11.11.11.111', '111.111.11.1']
import re
line = "inet addr:11.11.11.11 Bcast:11.11.11.111 Mask:111.111.11.1"
pattern = r"[\d]{2}[.][\d]{2}[.][\d]{2}[.][\d]{2}[\D]"
re.findall(pattern, line)
['11.11.11.11 ']
re.findall(pattern, line)[0].strip()
'11.11.11.11'
if you have more than one element in the list just run a list-comp using .strip()
[i.strip() for i in re.findall(pattern, line)]
['11.11.11.11']
re.match()
is not going to work because it will try to match your pattern starting at the beginning of the string (granted that your pattern does not include the " " portion. ”部分。
re.search()
works but it misses recurring elements and only returns the first encounter of the pattern upon a successful match, in addition you'll have to use filter
to extract the element.
finally, the key to solving this problem lies in the last character of your target, xx.xx.xx.xx[\\D]
. The [\\D]
directive ensures that the pattern looks for a no-integer at index 12, [\\s]
works equally well and it matches a space.
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