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【跟着AI学Python】第20天:正则表达式(re模块)

  • 2026-02-20 01:54:54
【跟着AI学Python】第20天:正则表达式(re模块)
Qwen3-Max:

太棒了!欢迎来到 【跟着AI学Python】第20天!🎉今天我们将学习 正则表达式(Regular Expressions) —— 文本处理的“瑞士军刀”!

💡 正则表达式能让你用简洁模式匹配、提取、替换复杂文本,是爬虫、日志分析、数据清洗的必备技能!


🎯 第20天目标:

✅ 掌握 基础元字符\d\w.*+?✅ 熟练使用 re.search() 和 re.findall()✅ 实战:提取邮箱、手机号


📘 一、正则表达式基础:元字符速查

元字符
含义
示例
\d
匹配任意数字 [0-9]
\d\d→ "23"
\w
匹配字母/数字/下划线 [a-zA-Z0-9_]
\w+→ "user_1"
.
匹配任意字符(除换行符)
a.c→ "abc", "a@c"
*
前面元素 0次或多次
ab*c → "ac", "abbc"
+
前面元素 1次或多次
ab+c → "abc", "abbbc"(不能是"ac")
?
前面元素 0次或1次
colou?r → "color", "colour"
^
字符串开头
^Hello → 匹配开头的 "Hello"
$
字符串结尾
world$ → 匹配结尾的 "world"

🔑 关键概念

  • 贪婪匹配:*/+ 默认尽可能多匹配(如 a.*b匹配 "a...b...b" 中最长部分)
  • 非贪婪匹配:加 ? 变成 *?/+?(如 a.*?b 匹配最短部分)

📘 二、re 模块核心函数

🔹 re.search(pattern, string)

  • 搜索字符串中第一个匹配项
  • 返回 Match 对象(有 .group() 方法)或 None
import retext = "我的电话是 13812345678"match = re.search(r"\d{11}", text)  # 匹配11位数字if match:    print("找到手机号:"match.group())  # 13812345678

🔹 re.findall(pattern, string)

  • 找出所有匹配项,返回列表
  • 若模式含分组 (),只返回分组内容
text = "邮箱: alice@example.com, 联系 bob@test.org"emails = re.findall(r"\w+@\w+\.\w+", text)print(emails)  # ['alice@example.com', 'bob@test.org']

✅ 原始字符串 r"":避免反斜杠转义(如 \d 不被解释为转义字符)


📘 三、实战1:提取邮箱

🔹 邮箱正则(简化版)

email_pattern = r"\w+@\w+\.\w+"
  • \w+ :用户名(字母/数字/下划线)
  • @ :必须包含 @
  • \w+\.\w+ :域名(如 example.com)

🔹 改进版(支持点、连字符)

# 更健壮的邮箱匹配(仍非完美,但覆盖常见格式)email_pattern = r"[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}"

🔹 代码示例


📘 四、实战2:提取中国大陆手机号

🔹 手机号规则

  • 11位数字
  • 以 1 开头
  • 第二位通常是 3-9(如 13x, 15x, 18x, 19x 等)

🔹 正则表达式

phone_pattern = r"1[3-9]\d{9}"
  • 1:第一位是1
  • [3-9]:第二位是3-9
  • \d{9}:后面9位数字

🔹 代码示例


📘 五、高级技巧:分组 () 与命名分组

🔹 提取结构化数据

import relog = "2026-01-28 10:30:45 [INFO] User login"# 使用分组提取日期、时间、级别、消息pattern = r"(\d{4}-\d{2}-\d{2})\s+(\d{2}:\d{2}:\d{2})\s+\[(.*)\]\s+(.*)"match = re.match(pattern, log.strip())if match:    date, time,level,msg = match.groups()    print(f"日期: {date}, 时间: {time},级别: {level}, 消息: {msg}")

🔹 命名分组(更清晰)

pattern = r"(?P<date>\d{4}-\d{2}-\d{2})\s+(?P<time>\d{2}:\d{2}:\d{2})\s+\[(?P<level>\w+)\]\s+(?P<msg>.*)"match = re.search(pattern, log)if match:    print(match.group("date")) 

💻 综合实战:日志分析器


✅ 今日小任务

1、用 re.findall()提取字符串 "价格: ¥199, 折扣: ¥29" 中的所有数字 → [199, 29]
2、写一个正则 匹配 URL(如 https://www.example.com/path)
# 任务1import retext = "价格: ¥199, 折扣: ¥29"prices = [int(x) for x in re.findall(r"\d+", text)]print(f"价格: {prices[0]}, 折扣: {prices[1]}")# 任务2(简化版)url = "https://www.example.com/page?id=123&name=Alice"url_pattern = r"https?://[^\s]+"urls = re.findall(url_pattern, url)print(urls)

📝 小结:正则表达式最佳实践

场景
建议
简单匹配
用 \d\w.* 快速构建
提取数据
优先 re.findall()
验证格式
用 ^...$ 锚定首尾
复杂需求
分组 () + 命名分组 (?P<name>...)
性能敏感
预编译正则:pattern = re.compile(r"...")

⚠️ 注意

  • 正则不是万能的(如解析 HTML 请用 BeautifulSoup
  • 复杂邮箱/URL 验证建议用专用库(如 email-validator

🎉 恭喜完成第20天!你已掌握 文本处理的核心利器,能高效提取结构化信息!

继续加油,你的数据处理能力越来越强了!🔍✨

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  1. CONNECT:[ UseTime:0.000550s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000905s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000295s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000302s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000469s ]
  6. SELECT * FROM `set` [ RunTime:0.000178s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000478s ]
  8. SELECT * FROM `article` WHERE `id` = 475601 LIMIT 1 [ RunTime:0.000427s ]
  9. UPDATE `article` SET `lasttime` = 1772260264 WHERE `id` = 475601 [ RunTime:0.007254s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000277s ]
  11. SELECT * FROM `article` WHERE `id` < 475601 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000449s ]
  12. SELECT * FROM `article` WHERE `id` > 475601 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000526s ]
  13. SELECT * FROM `article` WHERE `id` < 475601 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001208s ]
  14. SELECT * FROM `article` WHERE `id` < 475601 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005976s ]
  15. SELECT * FROM `article` WHERE `id` < 475601 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009245s ]
0.098240s