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这个正则帮解释一下！该如何处理

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Release： 2016-06-13 13:51:35
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这个正则帮解释一下！
下了一个发送邮件类，里面有个正则没看懂：
$body = ereg_replace("(^|(\r\n))(\.)", "\1.\3", $body);

------解决方案--------------------
每行第一个点.替换成 \1.\3
------解决方案--------------------
\1代表第一个匹配到的组，也就是(^|(\r\n))。
\3代表第三个匹配到的组，也就是(\.)

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