Python 正则与url匹配

ゝ一世哀愁。 2022-02-27 15:06 744阅读 0赞

详细用法可参考：[https://blog.csdn.net/weixin\_40907382/article/details/79654372][https_blog.csdn.net_weixin_40907382_article_details_79654372]

Django 1.9 前 url匹配方法可以同时匹配正则和字符串，但是1.9之后被划分为了两个方法。

首先我们回顾一下python正则：

正则(re)：是一种高级的字符串处理方式,主要用于字符串的匹配。

字符匹配被分为了两种：

内容匹配:通过描述内容的类型和长度来进行匹配的，匹配的精度比较高，比较繁琐

匹配手机号：匹配一个139开头的后面是8位数字的字符串

findall方法：在指定的字符串当做匹配所有满足条件的字符。

内容的类型:

原样匹配 通常用于和其他匹配结合

import re
    
    re.match #从开始位置开始匹配，如果开头没有则无
    
    re.search #搜索整个字符串
    
    re.findall #搜索整个字符串，返回一个list

import re
    a='hello world I am your friend I am 18_1 years old aheheha 333 4423'
    result = re.findall(r'h',a)
    print(result)    #['h', 'h', 'h', 'h']
    result = re.match(r'h',a).
    print(result)    #<_sre.SRE_Match object; span=(0, 1), match='h'>
    result = re.match(r'h',a).group()
    print(result)    # h
    result = re.search(r'h',a)
    print(result)    #<_sre.SRE_Match object; span=(0, 1), match='h'>
    result = re.search(r'h',a).group()
    print(result)    # h

. 匹配任意非换行字符

a='hello world I am your friend I am 18_1 years old aheheha 333 4423'
    result = re.findall(r'.',a)
    print(result)
    ['h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', ' ', 'I', ' ', 'a', 'm', ' ', 'y', 'o', 'u', 'r', ' ', 'f', 'r', 'i', 'e', 'n', 'd', ' ', 'I', ' ', 'a', 'm', ' ', '1', '8', '_', '1', ' ', 'y', 'e', 'a', 'r', 's', ' ', 'o', 'l', 'd', ' ', 'a', 'h', 'e', 'h', 'e', 'h', 'a', ' ', '3', '3', '3', ' ', '4', '4', '2', '3']

\\d 匹配所有的数字

a='hello world I am your friend I am 18_1 years old aheheha 333 4423'
    result = re.findall(r'\d',a)
    print(result)
    ['1', '8', '1', '3', '3', '3', '4', '4', '2', '3']

\\D 匹配所有非数字

a='hello world I am your friend I am 18_1 years old aheheha 333 4423'
    result = re.findall(r'\D',a)
    print(result)
    ['h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', ' ', 'I', ' ', 'a', 'm', ' ', 'y', 'o', 'u', 'r', ' ', 'f', 'r', 'i', 'e', 'n', 'd', ' ', 'I', ' ', 'a', 'm', ' ', '_', ' ', 'y', 'e', 'a', 'r', 's', ' ', 'o', 'l', 'd', ' ', 'a', 'h', 'e', 'h', 'e', 'h', 'a', ' ', ' ']

\\s 匹配所有的空格

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/S匹配所有非空格

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正则的方法

Findall 匹配所有的可能性

Search 从字符串当中匹配一次复合条件的字符，匹配到以组的格式返回

Match 从字符串开头匹配一次复合条件的字符，匹配到以组的格式返回

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Split 切分，重构字符串的split方法

![20190328222141295.png][]

贪婪和反贪婪

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[https_blog.csdn.net_weixin_40907382_article_details_79654372]: https://blog.csdn.net/weixin_40907382/article/details/79654372
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