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Python中的正则表达式

  • 2026-01-31 08:11:10
Python中的正则表达式

写在前面

正则表达式,又称规则表达式,可用单个字符串来描述、匹配某个句法规则的字符串,常被用来检索、替换哪些符合某个模式的文本(不理解匹配规则的同学可以参考:正则表达式)。Python中的正则表达式可通过re模块中的matchsearchfindall三个方法来实现

- re.match(匹配规则, 被匹配字符串)

匹配成功则返回匹配对象,匹配不成功则返回空。re.match默认从头部匹配,若头部不匹配,则后面的内容不参与匹配

re.search

检索整个字符串,找出匹配的,匹配一次后即停止检索。

re.findall

检索整个字符串,并返回所有匹配结果(值的list)

一、简单演示

# re.match# 默认从头部匹配,若头部不匹配,则后面的内容不参与匹配import rematch_res = re.match('Biomamba','I am Biomamba')print(match_res)# 可以看出虽然我们后面的话中包含"Biomamba",但是结果并没有返回。
## None
# 我们把单词的顺序换一下match_res = re.match('Biomamba','Biomamba is me')print(match_res)# 可以看到返回了字符串对应的坐标
## <_sre.SRE_Match object; span=(0, 8), match='Biomamba'>
# match_res中的信息可以被分别取出:print(match_res.span())
## (0, 8)
print(match_res.start())
## 0
print(match_res.end())
## 8
# re.search # 检索整个字符串,找出匹配的,匹配一次后即停止检索import research_res = re.search('Biomamba','I am Biomamba. Biomamba is me.')print(search_res)# 可以看出只返回了第一个"Biomamba"的坐标。
## <_sre.SRE_Match object; span=(5, 13), match='Biomamba'>
# re.findall# 检索整个字符串,并返回所有匹配结果(值的list)import refindall_res = re.findall('Biomamba','I am Biomamba. Biomamba is me.')print(findall_res)# 可以看出返回了所有值
## ['Biomamba', 'Biomamba']
print(type(findall_res))# 返回的对象是一个list
## <class 'list'>

二、元字符

元字符指一类具有特定功能,用于匹配特定字符串的字符。

18.2.1 字符匹配

# 简单的举几个例子:import remy_word ='I am Biomamba.This year is 2023 . Biomamba is me.'# 找出这句话中所有的数字re.findall('[0-9]',my_word) # 可见匹配到的所有数字被列出:
## ['2', '0', '2', '3']
# 或者我们换个写法依旧可以匹配到所有的数字import remy_word ='I am Biomamba.This year is 2023 . Biomamba is me.'# 找出这句话中所有的数字re.findall('\d',my_word) # 可见匹配到的所有数字被列出:
## ['2', '0', '2', '3']
# 找出所有的大写字母import remy_word ='I am Biomamba.This year is 2023 . Biomamba is me.'re.findall('[A-Z]',my_word) # 可见匹配到的所有的大写字母被列出:
## ['I', 'B', 'T', 'B']
# 找出所有字母import remy_word ='I am Biomamba.This year is 2023 . Biomamba is me.'re.findall('[A-z]',my_word) # 可见匹配到的所有字母被列出:
## ['I', 'a', 'm', 'B', 'i', 'o', 'm', 'a', 'm', 'b', 'a', 'T', 'h', 'i', 's', 'y', 'e', 'a', 'r', 'i', 's', 'B', 'i', 'o', 'm', 'a', 'm', 'b', 'a', 'i', 's', 'm', 'e']
# 找出所有空格及其前面的一个字符my_word ='I am Biomamba.This year is 2023 . Biomamba is me.'re.findall('.\s',my_word)
## ['I ', 'm ', 's ', 'r ', 's ', '3 ', '. ', 'a ', 's ']
# 找出所有空格及其前面的一个字符my_word ='I am Biomamba.This year is 2023 . Biomamba is me.'re.findall('.\s',my_word)
## ['I ', 'm ', 's ', 'r ', 's ', '3 ', '. ', 'a ', 's ']
# 匹配任意字符任意次re.findall('.*',my_word) # 可以看到完整的内容被匹配与打出
## ['I am Biomamba.This year is 2023 . Biomamba is me.', '']

18.2.2 数量匹配:

import remy_word ='I am Biomamba.BBBiomamba. iomamba.This year is 2023 . Biomamba is me.'# 匹配B字符任意次及后接iomamba字符re.findall('B*iomamba',my_word)# 可以看出 Biomamba 、iomamba 和 BBBiomamba 均可以被打印出
## ['Biomamba', 'BBBiomamba', 'iomamba', 'Biomamba']
# 匹配B字符一次及后接iomamba字符re.findall('B+iomamba',my_word)# 可以看出iomamba无法被打印出
## ['Biomamba', 'BBBiomamba', 'Biomamba']
# 匹配最少三次B后接iomambamy_word ='I am Biomamba. BBiomamba.BBBiomamba. BBBBiomamba .iomamba.This year is 2023 . Biomamba is me.'re.findall('B{3,}iomamba',my_word)# 可以看到只有三个及以上的B被输出
## ['BBBiomamba', 'BBBBiomamba']
# 匹配二至三次B后接iomambare.findall('B{2,3}iomamba',my_word)
## ['BBiomamba', 'BBBiomamba', 'BBBiomamba']

18.2.3 边界匹配

import remy_word ='I am Biomamba.This year is 2023 . Biomamba is me.'# 匹配字符串开头和之后的一个字符re.findall('^.',my_word)
## ['I']
# 匹配字符串结尾和之前的两个字符re.findall('.{2}$',my_word)
## ['e.']
# 匹配字符串中单词非边界前为a的单词re.findall('a\B',my_word)
## ['a', 'a', 'a', 'a']

其它匹配依次类推,正则表达式在所有平台与语言中几乎都是通用的,详情可见我们的Linux课程生信小白的Linux保姆级教程。

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Python判断语句

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  1. CONNECT:[ UseTime:0.000477s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000668s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001630s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000570s ]
  6. SELECT * FROM `set` [ RunTime:0.000248s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000581s ]
  8. SELECT * FROM `article` WHERE `id` = 464936 LIMIT 1 [ RunTime:0.001947s ]
  9. UPDATE `article` SET `lasttime` = 1770513751 WHERE `id` = 464936 [ RunTime:0.007156s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000271s ]
  11. SELECT * FROM `article` WHERE `id` < 464936 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000430s ]
  12. SELECT * FROM `article` WHERE `id` > 464936 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000387s ]
  13. SELECT * FROM `article` WHERE `id` < 464936 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000979s ]
  14. SELECT * FROM `article` WHERE `id` < 464936 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004951s ]
  15. SELECT * FROM `article` WHERE `id` < 464936 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001903s ]
0.093702s