Python Regular Expressions Match ip address instances and python Regular Expressions

Python Regular Expressions Match ip address instances and python Regular Expressions

This example describes an instance where the regular expression matches an IP address. The code structure is easy to understand. Share it with you for your reference.

The main implementation code is as follows:

import rereip = re.compile(r'(?<![\.\d])(?:\d{1,3}\.){3}\d{1,3}(?![\.\d])')  for ip in reip.findall(line):    print "ip>>>", ip

I hope this article will help you with Python programming.

A python Regular Expression

#! /Usr/bin/env python3
# Coding = UTF-8

"""
Parse ip and path
"""

Import re

Def checkpath (s ):
Express = r "(\ d + \. \ d +) :(. + )"
Mo = re. search (express, s)
If mo:
Ip = mo. group (1)
Path = mo. group (2)
Print ('IP is % s, path is % s' % (IP, path ))
Return ip, path
Else:
Print ('the path you input is invalid ')
Return None

Def test_checkpath ():
Assert checkpath ('192. 168.22.77:/home/adf ') = ('192. 168.22.77 ',
'/Home/fund ')
Assert checkpath ('192. 192:/home/jd') is None
Assert checkpath ('192. 168.22.77/home/fund') is None
Assert checkpath ('192. 168.22.77: ') is None

Pay attention to the usage of re module. This is only a preliminary judgment. If you really want to determine the validity of the IP address, you cannot use it alone. For example, if each group of numbers must be <255, no judgment is made. You can adjust whether or not null values are allowed in the path section. The general usage is for reference.

If you do not need to consider the validity of the input, directly
Ip, path = input_string.split (':')
That's all.

How does the python regular expression match strings?

Complete code :#! /Usr/bin/python #-*-coding: UTF-8 -*-
"""
Function:
How does the python regular expression match strings?

Author: Crifan LiVersion: 2012-12-08
Contact: admin at crifan dot com
"""

Import re;
Txt = "bn ', 'dd _ ff'); xm_a ([1, 'zhangming', 0.999, 'yuwenjige', 'lishijige, 0.999,]); xm_a ([2, 'wangmeng', 'shuxuejige ', 'dilijige', 0,]); xm_a ([3, 'wangli ', 0.999, 'shuxuejige', 'dilijige ',]); zuobi (6, 3, '4: 5 '); fg_gh ('xxx', 'vb _ 4'); xm_a ([4, 'dash', 'huaxuejige', 'yingyujige, 1, 0.999,]); </";
# Note: Forward-Negative match is used here # If you are not familiar with it, refer:
# [Tutorial] Explain the Python Regular Expression in detail :(?!...) Negative lookahead assertion forward negative match/forward negative assertions
Jige = re. findall ("xm_a \ (\ [\ d +, '(\ w +)', [^ \ (\) \ [\] + \] \); (?! Zuobi) ", txt );
Print jige; # ['zhangming', 'wangmeng', 'dash']

In addition, if you are interested, you can go to my series of tutorials:
[Tutorial] describes Python Regular Expressions

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