Python 什么样的regexp可以用来标识；原始信息；gmail中的前缀？

例如，签名可以是：

On Tue, Mar 20, 2012 at 2:38 PM, Johnny Walker <johnny.talker@gmail.com> wrote:

2012年3月20日星期二下午2:38，约翰尼·沃克写道：

然后是引用的回复。我确实有一种离散的感觉，虽然这是特定于语言环境的，但这让我成为一个悲伤的程序员

我之所以要求这样做，是因为在通过gmail回复问题时没有正确地去除这些内容。我认为，

origmsg\u re

是我需要在

keep\u quoted\u text=no

旁边设置的config.ini变量来解决这个问题

现在它是默认的

origmsg\u re=^[>\s]*-\s？原始消息\s？-$

编辑：现在我使用的是

origmsg\u re=
^在[^上，以下正则表达式将以非常安全的方式匹配Gmail前缀。它确保在…上有3个逗号和升文本

On([^,]+,){3}.*?wrote:

如果正则表达式应该以不区分大小写的方式匹配，那么不要忘记添加修饰符

if re.search("On([^,]+,){3}.*?wrote:", subject, re.IGNORECASE):
    # Successful match
else:
    # Match attempt failed

你好，巴克利

Match the characters “On” literally «On»
Match the regular expression below and capture its match into backreference number 1 «([^,]+,){3}»
   Exactly 3 times «{3}»
   Note: You repeated the capturing group itself.  The group will capture only the last iteration.  Put a capturing group around the repeated group to capture all iterations. «{3}»
   Match any character that is NOT a “,” «[^,]+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
   Match the character “,” literally «,»
Match any single character that is not a line break character «.*?»
   Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?»
Match the characters “wrote:” literally «wrote:»

Created with RegexBuddy

谢谢，我最终还是用了这个：
origmsg\u re=^On.+写了：$