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import re



a = ["<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />",

   '<meta http-equiv=Content-Type content="text/html;charset=gb2312">',

   '<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">',

   '<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />',

   '<meta http-equiv="content-type" content="text/html; charset=utf-8" />',

   '<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />',

   '<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />'

   ]







b = "<meta[ ]+http-equiv=["']?content-type["']?[ ]+content=["']?text/html;[ ]*charset=([0-9-a-zA-Z]+)["']?"





B = re.compile(b, re.IGNORECASE)





for ax in a:

  r1 = B.search(ax)



  if r1:

    print r1.group()

    print r1.group(1), len(r1.group())

  else:

    print 'not match'