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学会Python正则表达式:秒变文本搜索、匹配、筛选高手!

  • 2026-02-05 00:59:47
学会Python正则表达式:秒变文本搜索、匹配、筛选高手!

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🌈Hi,小伙伴们~

🛠️当需要匹配、搜索、替换文本内容时,正则表达式可能是你当之无愧的首选!它通过特定规则组成的模式(Pattern),能精准匹配文本中的目标字符,无论是在格式验证、文本处理、网络爬虫还是日志分析,正则表达式都扮演着重要角色

🎯今天,梳理和总结一下它的用法,帮你跨过它那看似复杂的语法门槛~

一、正则表达式核心原理 ⚙️

本质:是用特殊符号描述的字符串匹配规则。想象成一个"文本筛子":你定义好筛孔的形状和大小,文本经过时,符合规则的部分就被"筛"出来

🎯核心思想 :用简短的代码描述复杂的文本模式,而不是写冗长的判断逻辑

二、常用符号速记表 📚

3.1 基本匹配 🔤

  • \d → 数字(0-9) 0️⃣1️⃣2️⃣
  • \w → 单词字符(字母/数字/下划线)
  • \s → 空白字符(空格、制表符等) ␣
  • . → 任意单个字符(除了换行符) 🎲
  • ^ → 字符串开头
  • $ → 字符串结尾

3.2 数量控制 🔢

  • * → 0次或多次 ⭕⭕⭕
  • + → 1次或多次 1️⃣/1️⃣2️⃣3️⃣
  • ? → 0次或1次 0️⃣/1️⃣
  • {n} → 正好n次 3️⃣3️⃣3️⃣
  • {n,m} → n到m次 2️⃣3️⃣

3.3 逻辑与分组 🧩

  • [abc] → 匹配a、b、c中任意一个 🅰️/🅱️/🅲️
  • [a-z] → 匹配a到z任意一个字母 🔤
  • | → 或(匹配左边或右边) ↔️
  • () → 分组(提取这部分内容) 📦

3.4 特殊字符与转义 🔧

  • \. → 匹配实际的点号(不是任意字符) ⚫
  • \\ → 匹配反斜杠 \(不是转义符) ⬅️
  • \* → 匹配*号(不是重复符) ✳️
  • \+ → 匹配+号(不是多次符) ➕
  • \? → 匹配?号(不是可选符) ❓
  • \t → 匹配制表符 ⇥
  • \n → 匹配换行符 ↵
  • \r → 匹配回车符 ↩

3.5 预定义字符集 📦

  • \D → 匹配非数字字符 🔢
  • \W → 匹配非单词字符 🔤
  • \S → 匹配非空白字符 ␣
  • \b → 匹配单词边界位置 🚧
  • \B → 匹配非单词边界位置 🚧

三、实用案例精炼 💼

✅3.1 数据验证之邮箱

#  邮箱验证defis_valid_email_advanced(email):    pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'return bool(re.match(pattern, email))
# 解析: ^[a-zA-Z0-9._%+-]+  用户名:允许更多特殊字符 @                   必须有@ [a-zA-Z0-9.-]+      域名部分:允许点号和中划线 \.[a-zA-Z]{2,}$     顶级域名:至少2个字母

✅3.2 数据验证之手机号码

#  手机号验证def is_valid_phone(phone):return bool(re.match(r'^1[3-9]\d{9}$', phone))
# 解析:^           - 字符串开头锚点,必须从开头匹配1           - 必须以数字1开头(中国手机号标准)[3-9]       - 第二位必须是3-9中的任意一个数字\d{9}       - 后面必须有正好9个数字$           - 字符串结尾锚点,必须匹配到结尾

✅3.3 信息提取

# 从混合文本中提取关键信息text = "张三,电话138-1234-5678,邮箱zhangsan@qq.com"#  提取姓名、电话、邮箱name = re.search(r'^(.+?),', text).group(1)phone = re.search(r'电话(\S+)', text).group(1)email = re.search(r'邮箱(\S+)', text).group(1)

✅3.4 文本清洗 🧹

# 清理不规范数据dirty_text = "价格:$100.00 特价!!优惠¥80.5元"#  提取所有价格数字prices = re.findall(r'[¥$](\d+\.?\d*)', dirty_text)print(prices)  #  ['100.00', '80.5']#  清理特殊字符cleaned = re.sub(r'[!!]''', dirty_text)print(cleaned)  # 价格:$100.00 特价优惠¥80.5元

四、记住这5个常用模式 🎯

  1. 📧 邮箱\w+@\w+\.\w+
  2. 📱 手机号1[3-9]\d{9}
  3. 🌐 网址https?://\S+
  4. 🖥️ IP地址\d+\.\d+\.\d+\.\d+
  5. 🇨🇳 中文[\u4e00-\u9fa5]+

五、工作原理图解 📈

原始文本:"我的电话是138-1234-5678"正则模式:r"(\d{3})-(\d{4})-(\d{4})"匹配过程:1. 🔍 正则引擎扫描文本2. ✅ 找到"138-1234-5678"符合模式3. 📦 括号分组捕获:   group(0): "138-1234-5678"# 整个匹配   group(1): "138"# 第一个括号   group(2): "1234"# 第二个括号   group(3): "5678"# 第三个括号

六、两个重要技巧 ⚡

6.1 贪婪 🐷 vs 非贪婪 🐇

text = "<div>标题</div><div>内容</div>"#  贪婪匹配(默认):尽可能多地匹配greedy = re.search(r'<div>.*</div>', text)print(greedy.group())  # <div>标题</div><div>内容</div>#  非贪婪匹配(加?):尽可能少地匹配lazy = re.search(r'<div>.*?</div>', text)print(lazy.group())    # <div>标题</div>

✅ 总结:要尽可能多地匹配就贪婪,少匹配就非贪婪

6.2 编译提高效率 ⚡

#  如果需要多次使用同一个正则,先编译pattern = re.compile(r'\d+')#  然后重复使用result1 = pattern.findall(text1)result2 = pattern.findall(text2)  # 更快!

七、总结 💡

记住思维方式:先想清楚你要匹配的什么特征,然后用符号去描述这个特征,比如匹配电话号码 → "1开头,后面10个数字" → 1\d{10}

大多数情况下,掌握上面列出的基本符号就足够解决80%的实际问题了

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  1. CONNECT:[ UseTime:0.001072s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001686s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000729s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000698s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001489s ]
  6. SELECT * FROM `set` [ RunTime:0.000549s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001521s ]
  8. SELECT * FROM `article` WHERE `id` = 472131 LIMIT 1 [ RunTime:0.001051s ]
  9. UPDATE `article` SET `lasttime` = 1770437585 WHERE `id` = 472131 [ RunTime:0.001663s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000688s ]
  11. SELECT * FROM `article` WHERE `id` < 472131 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002846s ]
  12. SELECT * FROM `article` WHERE `id` > 472131 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001133s ]
  13. SELECT * FROM `article` WHERE `id` < 472131 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008912s ]
  14. SELECT * FROM `article` WHERE `id` < 472131 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.025339s ]
  15. SELECT * FROM `article` WHERE `id` < 472131 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007332s ]
0.147725s