Python regular expression summary

search(pattern, string, flags=0): Find a match in a string

finddall(pattern, string, flags=0): Find a match and return a list of all matching parts

sub(pattern, repl, string, count=0, flags=0): Replace the part of the string that matches the regular expression with other values ​​

split(pattern, string, maxsplit=0, flags=0): Split the string according to the match, Returns a list of split strings

import urllibimport re

req = urllib.urlopen('http://www.imooc.com/course/list')

buf = req.read()
listurl = re.findall(r'http:.+\.jpg', buf)print listurl

i = 0for url in listurl:
    f = open(str(i) + '.jpg', 'w')
    req = urllib.urlopen(url)
    buf = req.read()
    f.write(buf)
    i += 1

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