正则表达式寻找一个字 [英] Regex pattern to look for a word

问题描述

我有以下的正则表达式模式2换行符后删除所有字符

I have the following Regex pattern to remove all characters after the 2 line breaks.

(?<=.+[\r\n]+.+[\r\n]+)([\s\S]*)

在这里，我的问题是，我也想要一个2换行后添加检查特定的文字，例如，如果被发现，不包括它。

My problem here is that I also wanted to add a check for a specific text, for example after that 2 line breaks and if it is found, do not include it.

这是我做我的C＃代码：

And here is how I do it on my c# code:

string newComment = string.IsNullOrEmpty(regexPattern) ? emailBody : new Regex(regexPattern, RegexOptions.IgnoreCase).Replace(emailBody, string.Empty);

修改

我想寻找一个特定的文字，例如这是一个标志：那么，如果它被发现，它不应该被包括在内，之后还什么，同时保持目前的设计都经过2换行符不会这被列入

I wanted to look for a specific text, for example "This is a signature:" then if it is found, it should not be included and anything after it also, while maintaining the current design which everything after 2 line breaks will not be included

样品字符串：

string body = "Try comment.";
string additionalBody = "This is a signature";
string newBody = body + System.Environment.NewLine + additionalBody + System.Environment.NewLine + "asd Asd";

所以 newBody 应导致3段。文

这应该会显示试评仅

可能出现的情况可能是：

Possible scenarios may be:

1）在第一或第二段，文本可以存在，并应被自动删除。

1) On the first or second paragraph, the text can be present and should be removed automatically.

2）如，自动签名是不存在的，但有3段，删除最后一个段落

2) If the automated signature is not present but there is 3 paragraphs, remove the last paragraph.

推荐答案

如何简单：

(?<=(?:.+[\r\n]+){2})([\s\S]*)This is a signature

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