问题描述
我正在解析一些电子邮件.我认为移动邮件，iPhone和iPod touch会附加一个签名作为单独的边界，从而使其易于删除.并非所有邮件客户端都这样做，仅使用'-'作为签名定界符.
I am parsing out some emails. Mobile Mail, iPhone and I assume iPod touch append a signature as a separate boundary, making it simple to remove. Not all mail clients do, and just use '--' as a signature delimiter.
我需要从字符串中剔除'-'，但仅是最后一次出现.
I need to chop off the '--' from a string, but only the last occurrence of it.
样本副本
hello, this is some email copy-- check this out
--
Tom Foolery
我很想在'-'上进行拆分，删除最后一部分，我会拥有它，但是explode()和split()似乎都没有返回很大的值，因为如果发生这种情况，让我知道它是否做了任何事情没有匹配项.
I thougth about splitting on '--', removing the last part, and I would have it, but explode() and split() neither seem to return great values for letting me know if it did anything, in the event there is not a match.
我不能让preg_replace跨越多行.我已经将所有行尾都标准化为\ n
I can not get preg_replace to go across more than one line. I have standardized all line endings to \n
以你好，这是一些电子邮件副本-检查出来"结尾的最佳建议是什么，如果没有，最好是在没有签名的情况下，当然在某些情况下我无法涵盖所有情况.
What is the best suggestion to end up with "hello, this is some email copy-- check this out", taking not, there will be cases where there is no signature, and there are of course going to be cases where I can not cover all the cases.
推荐答案
我认为，为了更加防弹，我将采用非正则表达式路线
I think in the interest of being more bulletproof, I will take the non regex route
echo substr($body, 0, strrpos($body, "\n--"));
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