我对regex还是很陌生，所以我尝试自己解决一段时间，但无法提出解决方案。（我正在尝试使用python 2.7做到这一点）
我有一个来自帖子和笔记的tumblr链接列表。他们看起来像
"http://TumblrUsername.tumblr.com/post/hello/notes/somemoresutff/464654"
我要做的是仅选择“ http://TumblrUsername.tumblr.com/ ”部分，其余部分保留下来，以便我可以编制tumblr用户列表。
我的代码看起来像这样，但是我的问题是如何选择想要的东西...
import urllib
import requests
import lxml
from bs4 import BeautifulSoup
def find_notes():
file = open('output.txt', 'w')
f = requests.get('http://fullthrottleauto.tumblr.com/post/132323884114/treunenthibault-ferrari-599xx-evo-as-i-love')
soup = BeautifulSoup(f.text, "lxml")
for post_note in soup.find_all('a', href=True):
print post_note['href']
returnline = str(post_note['href'])
if '.tumblr.com/' in returnline:
## I need to do some thing here to extract "only the http://username.tumblr.com/"
file.write(returnline + '\n')
find_notes()
下面的代码为什么工程正则表达式？ It prints links and writes them into a file specified by the path!
import urllib
import requests
import lxml
from bs4 import BeautifulSoup
def find_notes():
data_file = open(r"C:\Users\USER_NAME\Desktop\output.txt", 'ab')
f = requests.get('http://fullthrottleauto.tumblr.com/post/132323884114/treunenthibault-ferrari-599xx-evo-as-i-love')
soup = BeautifulSoup(f.text, "lxml")
for post_note in soup.find_all('a', {'rel':'nofollow'}):
if post_note['href'].endswith('.tumblr.com/') and post_note['href'].startswith('http') :
print post_note['href']
data_file.write(post_note['href']+'\n')
data_file.close()
find_notes()
它打印-
http://jambo077.tumblr.com/
http://jambo077.tumblr.com/
http://thelordlux.tumblr.com/
http://thelordlux.tumblr.com/
http://dp0d.tumblr.com/
http://dp0d.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://dp0d.tumblr.com/
http://dp0d.tumblr.com/
http://fraggreen.tumblr.com/
http://fraggreen.tumblr.com/
http://amazingcars.tumblr.com/
http://kennylayy.tumblr.com/
http://kennylayy.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://coco2280.tumblr.com/
http://coco2280.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://devrimdeniz3.tumblr.com/
http://devrimdeniz3.tumblr.com/
http://nicholasembly.tumblr.com/
http://nicholasembly.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://nicholasembly.tumblr.com/
http://nicholasembly.tumblr.com/
http://geee22.tumblr.com/
http://geee22.tumblr.com/
http://donymadero.tumblr.com/
http://donymadero.tumblr.com/
http://avromen.tumblr.com/
http://avromen.tumblr.com/
http://carbonmotors.tumblr.com/
http://carbonmotors.tumblr.com/
http://blackdragonheartrider.tumblr.com/
http://blackdragonheartrider.tumblr.com/
http://travelerintheworldofdreams.tumblr.com/
http://travelerintheworldofdreams.tumblr.com/
http://evo-dreaming.tumblr.com/
http://evo-dreaming.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://kareem121.tumblr.com/
http://kareem121.tumblr.com/
http://hotmenandhotcars.tumblr.com/
http://hotmenandhotcars.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://schnixon.tumblr.com/
http://schnixon.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://schnixon.tumblr.com/
http://schnixon.tumblr.com/
http://mikeawwr.tumblr.com/
http://mikeawwr.tumblr.com/
http://joshke1.tumblr.com/
http://joshke1.tumblr.com/
http://banginscrew.tumblr.com/
http://banginscrew.tumblr.com/
http://smiley-sj.tumblr.com/
http://smiley-sj.tumblr.com/
http://char1ie1000.tumblr.com/
http://char1ie1000.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://char1ie1000.tumblr.com/
http://char1ie1000.tumblr.com/
http://relentless-haedons.tumblr.com/
http://relentless-haedons.tumblr.com/
http://metinpurde.tumblr.com/
http://metinpurde.tumblr.com/
http://superkingchris.tumblr.com/
http://superkingchris.tumblr.com/
http://16frango16.tumblr.com/
http://16frango16.tumblr.com/
http://franck-brevet.tumblr.com/
http://franck-brevet.tumblr.com/
http://car1ba.tumblr.com/
http://car1ba.tumblr.com/
http://trezio.tumblr.com/
http://trezio.tumblr.com/
http://molounhuevofrito.tumblr.com/
http://molounhuevofrito.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://rebeccabum.tumblr.com/
http://rebeccabum.tumblr.com/
http://madv8.tumblr.com/
http://madv8.tumblr.com/
http://jrcs87lol.tumblr.com/
http://jrcs87lol.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://jrcs87lol.tumblr.com/
http://jrcs87lol.tumblr.com/
http://alegasta.tumblr.com/
http://alegasta.tumblr.com/
http://ericj3love.tumblr.com/
http://ericj3love.tumblr.com/
http://frostfiree.tumblr.com/
http://frostfiree.tumblr.com/
http://bull58.tumblr.com/
http://bull58.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://fumihirokoyama.tumblr.com/
http://fumihirokoyama.tumblr.com/
http://thethatnoelguysstuff.tumblr.com/
http://thethatnoelguysstuff.tumblr.com/
http://fullthrottleauto.tumblr.com/
http://thethatnoelguysstuff.tumblr.com/
http://thethatnoelguysstuff.tumblr.com/
http://peachedme.tumblr.com/
http://peachedme.tumblr.com/
http://il-salice-errante.tumblr.com/
http://il-salice-errante.tumblr.com/
http://fajhr.tumblr.com/
http://fajhr.tumblr.com/
http://jah-eras.tumblr.com/
http://jah-eras.tumblr.com/
http://fullthrottleauto.tumblr.com/
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