【Day3】2.re模块使用案例

课程目标

1、提取

2、匹配

3、替换

1、提取

import re

ret = re.findall([正则表达式])

#  返回的类型是列表

2、匹配

import re

ret = re.match([正则表达式],[被匹配的字符串])

if(ret):

    return '匹配成功'

else:

    return '匹配失败'

#  如果匹配成功，返回<class 're.Match'>对象

#  如果匹配不成功，返回None

3、替换

import re

ret = re.sub([正则表达式],[替换成的字符串],[被替换的字符串])

import re

with open('index.html','r',encoding='utf-8') as f:

        html = f.read()

        # print(html)

        html = re.sub('\n','',html)

        pattern_1 = '<div class="email">(.*?)</div>'

        ret_1 = re.findall(pattern_1,html)

        print(ret_1[0].strip())

pwd_pattern = r'^[a-zA-Z][a-zA-Z0-9_]{5,15}$'

pwd1 = ''

pwd2 = 'a123123'

pwd3 = 'aaa'

print(re.match(pwd_pattern,pwd1))

print(re.match(pwd_pattern,pwd2))

print(re.match(pwd_pattern,pwd3))

index.html

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

<div>

    <div class="email">

        Email:1@qq.com

    </div>

    <div class="mobile">

        Mobile:18688888888

    </div>

</div>

</body>

</html>

巴特西

【Day3】2.re模块使用案例

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