【正则表达式】斗破苍穹（Python & R）

Python

# 加载模块
import re
import time
import requests

# 伪装报头
headers = {
   'User-Agent' : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) \
   AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36'
}

# 在指定路径以追加方式新建txt文件，后续写入数据
f = open('D://Spyder/WD/novel.txt', 'a+')

# 定义get_links，获取每一章的链接地址
def get_links(url):
    destination = requests.get(url, headers = headers)
    links = re.findall('
, destination.text)
    urls = ['http://www.doupoxs.com{}'.format(link) for link in links]
    for url in urls:
        get_info(url)
        print(url+'...Done')

# 定义get_info，获取每一章链接中的正文，注意写入本地txt时转码
def get_info(url):
    destination = requests.get(url, headers = headers)
    contents = re.findall('
(.*?)
', destination.content.decode('utf-8'), re.S)
    for content in contents:
        f.write(content + '\n')

# 程序入口
if __name__ in '__main__':
    url = 'http://www.doupoxs.com/doupocangqiong/'
    get_links(url)
    time.sleep(1)

# 关闭写入
f.close()

---

R

# 加载包
library(stringr)

# 定义GetlinkFunc，获取每一章的链接地址
GetlinkFunc <- function(url) {
  destination <- readLines(url, encoding = 'UTF-8')
  data <- str_extract_all(destination, '
'
'', .) %>% paste0('http://www.doupoxs.com', .)
}

# 定义GetinfoFunc，获取每一章链接中的正文，str_extract_all将标签名
也匹配出来，用gsub去除
GetinfoFunc <- function(url) {
  for (i in seq_along(url)) {
    destination <- readLines(url[i], encoding = 'UTF-8')
    data <- str_extract_all(destination, '
(.*?)
') %>% unlist() %>% gsub('
|
', '', .)
    print(sprintf('第%d条链接%s抓取成功', i, url[i]), sep = '\n')
    write.table(data, row.names = FALSE, col.names = FALSE, sep = '\n', append = TRUE, 'novel.txt')
  }
}

# 执行函数(导出txt文件)
url <- 'http://www.doupoxs.com/doupocangqiong/'
link <- GetlinkFunc(url)
novel <- GetinfoFunc(link)