C#中的多行正则表达式
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Multiline regular expression in C#
提问by Priyank Bolia
How do I match and replace text using regular expressions in multiline mode?
如何在多行模式下使用正则表达式匹配和替换文本？
I know the RegexOptions.Multilineoption, but what is the best way to specify match all with the new line characters in C#?
我知道RegexOptions.Multiline选项，但是在 C# 中指定 match all 与换行符的最佳方法是什么？
Input:
输入：
<tag name="abc">this
is
a
text</tag>
Output:
输出：
[tag name="abc"]this
is
a
test
[/tag]
Aahh, I found the actual problem. '&' and ';' in Regex are matching text in a single line, while the same need to be escaped in the Regex to work in cases where there are new lines also.
啊哈，我发现了真正的问题。'＆' 和 ';' 在正则表达式中匹配一行中的文本，而同样需要在正则表达式中进行转义才能在有新行的情况下工作。
采纳答案by dxh
If you mean there hasto be a newline character for the expression to match, then \nwill do that for you.
如果你的意思是有有是为表达式匹配换行符，那么\n就会为你做的。
Otherwise, I think you might have misunderstood the Multiline/Singlelineflags. If you want your expression to match across several lines, you actually want to use RegexOptions.Singleline. What it means is that it treats the entire input string as a single line, thus ignoring newlines. Is this what you're after...?
否则，我认为您可能误解了Multiline/ Singleline标志。如果您希望表达式跨多行匹配，您实际上想要使用RegexOptions.Singleline. 这意味着它将整个输入字符串视为一行，从而忽略换行符。这就是你所追求的......？
Example
例子
Regex rx = new Regex("<tag name=\"(.*?)\">(.*?)</tag>", RegexOptions.Singleline);
String output = rx.Replace("Text <tag name=\"abc\">test\nwith\nnewline</tag> more text...", "[tag name=\"\"][/tag]");
回答by Andomar
Here's a regex to match. It requires the RegexOptions.Singlelineoption, which makes the .match newlines.
这是一个匹配的正则表达式。它需要RegexOptions.Singleline使.匹配换行符的选项。
<(\w+) name="([^"]*)">(.*?)</>
After this regex, the first group contains the tag, the second the tag name, and the third the content between the tags. So replacement string could look like this:
在此正则表达式之后，第一组包含标签，第二组包含标签名称，第三组包含标签之间的内容。所以替换字符串可能如下所示：
[ name=""][/]
In C#, this looks like:
在 C# 中，这看起来像：
newString = Regex.Replace(oldString,
@"<(\w+) name=""([^""]*)"">(.*?)</>",
"[ name=\"\"][/]",
RegexOptions.Singleline);
