reg = re.compile('.*g_img={url: "(http.*"')

# -*-coding:utf-8-*-
import os
import re
 
f = open('bing.html','r')
 
line = r'''Bnp.Internal.Close(0,0,60056); } });;g_img={url: "https://az12410.vo.msecnd.net/homepage/app/2016hw/BingHalloween_BkgImg.jpg",id:'bgDiv',d:'200',cN'''
data = f.read().decode('utf-8','ignore').encode('gbk','ignore')
 
print " "
 
reg = re.compile('.*g_img={url: "(http.*"')
 
if re.match(reg, data):
  m1 = reg.findall(data)
  print m1[0]
else:
  print("data Not match .")
  
print 20*'-'
#print line
if re.match(reg, line):
  m2 = reg.findall(line)
  print m2[0]
else:
  print("line Not match .")

re.compile('.*g_img={url: "(http.*"')。

re.DEBUG Display debug information about compiled expression.
re.I 
re.IGNORECASE Perform case-insensitive matching; expressions like [A-Z] will match lowercase letters, too. This is not affected by the current locale.

re.L 


re.LOCALE Make \w, \W, \b, \B, \s and \S dependent on the current locale.

re.M 


re.MULTILINE When specified, the pattern character '^' matches at the beginning of the string and at the beginning of each line (immediately following each newline); and the pattern character '$' matches at the end of the string and at the end of each line (immediately preceding each newline). By default, '^' matches only at the beginning of the string, and '$' only at the end of the string and immediately before the newline (if any) at the end of the string.

re.S 


re.DOTALL Make the '.' special character match any character at all, including a newline; without this flag, '.' will match anything except a newline.re.U re.UNICODE Make \w, \W, \b, \B, \d, \D, \s and \S dependent on the Unicode character properties database.New in version 2.0.

re.X 


re.VERBOSE This flag allows you to write regular expressions that look nicer and are more readable by allowing you to visually separate logical sections of the pattern and add comments. Whitespace within the pattern is ignored, except when in a character class or when preceded by an unescaped backslash. When a line contains a # that is not in a character class and is not preceded by an unescaped backslash, all characters from the leftmost such # through the end of the line are ignored.

reg = re.compile('.*g_img={url: "(http.*"', re.S)