pattern = '\\(.*?\\)|\\{.*?}|\\[.*?]'这段代码对不对
时间: 2024-01-01 21:23:31 浏览: 57
对的,这段代码是用来匹配括号内的内容的正则表达式模式。它可以匹配包含在圆括号、花括号或方括号中的任何内容。这个模式使用了非贪婪匹配,即在匹配到第一个闭合括号时就停止匹配。下面是一个示例:
```python
import re
pattern = r'\(.*?\)|\{.*?\}|\[.*?\]'
text = 'This is (some text) with {brackets} and [square brackets].'
matches = re.findall(pattern, text)
print(matches) # 输出:['(some text)', '{brackets}', '[square brackets]']
```
这段代码会找到文本中所有包含在括号内的内容,并将其作为匹配项返回。注意,这里使用了原始字符串(raw string)来定义正则表达式模式,以避免反斜杠的转义问题。
相关问题
pattern = re.compile( '<dd>.*?board-index.*?>(.*?) </i>.*?data-src="(.*?)".*?name.*?a.*?>(.*? )</),*2star,*2(,*9) </0》,*/releasetime,*2(*I
这段代码是使用Python中的re模块来解析网页内容。其中,pattern = re.compile('<dd>.*?board-index.*?>(.*?)</i>.*?data-src="(.*?)".*?name.*?a.*?>(.*?)</a>.*?star.*?>(.*?)</p>.*?releasetime.*?>(.*?)</p>.*?integer.*?>(.*?)</i>.*?fraction.*?>(.*?)</i>.*?</dd>', re.S)是定义了一个正则表达式的模式,用于匹配特定格式的文本。
items = re.findall(pattern, html)则是使用该模式来在html中查找所有匹配的内容,并以列表的形式返回结果。
用正则表达式<dd>.*?board-index.*?>(.*?)</i>.*?data-src="(.*?)".*?name.*?a.*?>(.*?)</a>.*?star.*?>(.*?)</p>.*?releasetime.*?>(.*?)</p>.*?integer.*?>(.*?)</i>.*?fraction.*?>(.*?)</i>.*?</dd>爬取猫眼电影排行:爬取猫眼电影TOP100的所有信息。网址:https://www.maoyan.com/board/4
你可以使用以下代码使用正则表达式爬取猫眼电影TOP100的所有信息:
```python
import re
import requests
url = 'https://www.maoyan.com/board/4'
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36'
}
response = requests.get(url, headers=headers)
html = response.text
pattern = re.compile('<dd>.*?board-index.*?>(.*?)</i>.*?data-src="(.*?)".*?name.*?a.*?>(.*?)</a>.*?star.*?>(.*?)</p>.*?releasetime.*?>(.*?)</p>.*?integer.*?>(.*?)</i>.*?fraction.*?>(.*?)</i>.*?</dd>', re.S)
results = re.findall(pattern, html)
for result in results:
index = result[0]
image = result[1]
title = result[2]
actor = result[3].strip()[3:]
release_time = result[4].strip()[5:]
score = result[5] + result[6]
print(f'排名:{index}\n海报:{image}\n电影名:{title}\n主演:{actor}\n上映时间:{release_time}\n评分:{score}\n')
```
这段代码会发送一个GET请求到指定的URL,获取网页的HTML内容。然后使用正则表达式匹配对应的信息,并进行打印输出。注意在请求中需要添加User-Agent头部信息,以模拟浏览器访问。
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