Python正则表达式匹配HTML页面编码

html页面一般都会指定一个编码，如何获取到是处理html页面的第一步，因为错误的编码必然带来后面处理的问题。这里我用python的正则表达式写了个：

    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'