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python爬虫篇之正则表达式(一)

  • 2026-03-27 19:19:46
python爬虫篇之正则表达式(一)

3.27

正则表达式

目录:

1、什么是正则表达式

2、元字符之通配符与字符集

(1)通配符"."

(2)字符集[]

3、元字符之重复符

(1)重复元字符:{}

(2)重复元字符:*

(3)重复元字符:+

(4)重复元字符:?

1

什么是正则表达式

Python正则表达式是用于匹配和处理文本的强大利器,它通过特定模式在字符串中搜索、匹配和替换内容。

在Python中,正则表达式由re模块提供支持,包含search()、match()、findall()等方法,可用于数据验证、文本提取、格式转换等场景。

其核心语法包括字符匹配、分组捕获、量词限定等,是处理复杂字符串操作的必备工具。

2

元字符之通配符与字符集

(1)通配符"."

通配符、万能通配符或通配元字符,匹配1个除了换行符\n以外任何。

(2)字符集[]

字符集,匹配一个中括号中出现的任意原子符号。

import res = "apple ape agree age amaze animate advertise a\ne"# ret = re.findall(pattern="a.e", string=s)ret = re.findall("a.e", s)  # 注意,这里的pattern不是手打的print(ret)
import re= "apple ape agree age amaze animate advertise a\ne a&e a@e a6e a9e"ret1 = re.findall("a.e", s)ret2 = re.findall("a[pg]e", s)ret3 = re.findall("a[a-zA-Z]e", s)ret4 = re.findall("a[0-9]e", s)ret5 = re.findall("a[^0-9]e", s)print(f"'.'匹配1个除了换行符\\n以外任何:{ret1},\n'[pg]'匹配p或者g:{ret2},\n'[a-zA-Z]'匹配任何一个大小写字母:{ret3},\n'[0-9]'匹配任何一个数字:{ret4},\n'^'取反字符,匹配任何一个不是数字的:{ret5}")

3

元字符之重复符

重复相关的4个元字符:{}、*、+、?

(1)重复元字符:{}

{n,,m}:数量范围贪婪符,指定左边原子的数量范围,有{n},{n,},{,m},{n,m}四种写法,其中n与m必须是非负整数。

关键点:重复默认按贪婪匹配,可以通过在重复符右边加一个?取消贪婪匹配,按照非贪婪模式匹配。

import re# {}:指定左边原子的可以重复的数量范围s = "aeeee apple acee ape agree age amaze animate advertise a\ne a&e a@e a6e a9e"ret1 = re.findall("a...e", s)ret2 = re.findall("a.{3}e", s)# 默认贪婪匹配:按着最大匹配数进行匹配ret3 = re.findall("a.{1,3}e", s)  # 优先匹配3个重复# 在重复符后面就跟着一个?,取消贪婪匹配按着最小匹配数进行优先匹配ret4 = re.findall("a.{1,3}?e", s)  # 优先匹配1个重复# {2,}:2-无穷大ret5 = re.findall("a.{2,}e", s)# 更改模式re.S,可以匹配任意符号ret6 = re.findall("a.{2,}e", s, re.S)# 将通配符替换为字符集ret7 = re.findall("a[a-z]{1,3}e", s)ret8 = re.findall("a[^a-z\n]{1,3}e", s)  # [^a-z\n]表示不匹配a-z字母以及换行符\nprint(f"默认存通配符...输出ret1:{ret1}")print(f"将通配符...换为.{3}输出ret2:{ret2}")print(f".{1,3}贪婪模式输出ret3:{ret3}")print(f".{1,3}?取消贪婪模式输出ret4:{ret4}")print(f".{2,}输出ret5:{ret5}")print(f".{2,}加更改模式re.S输出ret6:{ret6}")print(f"通配符.替换为字符集[a-z]输出ret7:{ret7}")print(f"通配符.替换为字符集[^a-z\n]输出ret8:{ret8}")

(2)重复元字符:*

*:指定左边原子出现0次或多次,等同{0,}

import re# *:指定左边原子出现0次或多次,等同{0,}s = "aeeee apple acee ape agree age amaze animate advertise a\ne a&e a@e a6e a9e"ret1 = re.findall("a.{0,}e", s)ret2 = re.findall("a.*e", s)  # 默认贪婪匹配ret3 = re.findall("a.*?e", s)  # 取消贪婪匹配按着最小匹配数进行优先匹配print(f"{0,}输出ret1:{ret1}")print(f"*输出ret2:{ret2}")print(f"*?输出ret3:{ret3}")

(3)重复元字符:+

+:指定左边原子出现1次或多次,等同{1,}

import re# +:指定左边原子出现1次或多次,等同{1,}s = "aeeee apple acee ape agree age amaze animate advertise a\ne a&e a@e a6e a9e"ret1 = re.findall("a.{1,}e", s)ret2 = re.findall("a.+e", s)  # 默认贪婪匹配ret3 = re.findall("a.+?e", s)  # 取消贪婪匹配按着最小匹配数进行优先匹配print(f"{0,}输出ret1:{ret1}")print(f".+输出ret2:{ret2}")print(f".+?输出ret3:{ret3}")

(4)重复元字符:?

?:指定左边原子出现1次或多次,等同{0,1}

注意:?左右没有元字符时,等同{0,1}

import re# ?:指定左边原子出现1次或多次,等同{0,1}s = "https://www.baidu.com/, https://www.ooaac.com/, https://www.youdao.com/"ret1 = re.findall("https?://www.*?.com", s)  # ? 贪婪匹配{0,1}# ret2 = re.findall("https??://www.*?.com", s)  # ??取消贪婪匹配{0,1}print(f"?输出ret1:{ret1}")# print(f"??输出ret2:{ret2}")

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  1. CONNECT:[ UseTime:0.000386s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000715s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000308s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000267s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000476s ]
  6. SELECT * FROM `set` [ RunTime:0.000190s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000564s ]
  8. SELECT * FROM `article` WHERE `id` = 483399 LIMIT 1 [ RunTime:0.002322s ]
  9. UPDATE `article` SET `lasttime` = 1774643042 WHERE `id` = 483399 [ RunTime:0.008755s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000252s ]
  11. SELECT * FROM `article` WHERE `id` < 483399 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000891s ]
  12. SELECT * FROM `article` WHERE `id` > 483399 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000351s ]
  13. SELECT * FROM `article` WHERE `id` < 483399 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004421s ]
  14. SELECT * FROM `article` WHERE `id` < 483399 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001035s ]
  15. SELECT * FROM `article` WHERE `id` < 483399 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001331s ]
0.099275s