python正则抓取

  有这么一段内容如下，我需要把IP和对应的MAC分别的抓取出来，我不知道该如何入手了。

刘辉    192.168.1.2     E8:9A:8F:8E:7E:C2
陈瑾    192.168.1.3     1C:6F:65:61:81:1F
卢万敏  192.168.1.5     88:AE:1D3:71:32
徐莹    192.168.1.4     00:1A:4D:34:12:9E
  >>> import re
    >>> with open('a') as f:
    ...     for line in f:
    ...             aList = re.findall('\S+',line)
    ...             print aList[1],aList[2]
    ...
    192.168.1.2 E8:9A:8F:8E:7E:C2
    192.168.1.3 1C:6F:65:61:81:1F
    192.168.1.5 88:AE:1D:32:71:32
    192.168.1.4 00:1A:4D:34:12:9E
    #! /usr/bin/python
    #encoding=utf-8

    import re
    srcfile="in.txt"

    patterm = re.compile("^\[.*?\]\s+?at")
    patterm2 =re.compile("Exception")
    try:
            f=open(srcfile)
            fout = open("out.txt","w")
    except:
            raise IOError('..')

    lines = [line for line in f.readlines()]

    for line in lines:
            content = patterm.search(line)
            if content is not None:
                    fout.write(line)
            content = patterm2.search(line)
            if content is not None:
                    fout.write(line)
    f.close()
    fout.close()