[英]How do you split a string if you know the start and stop point but not the middle in asp.net C#
I'm attempting to remove a section of a string that can change at anytime.我正在尝试删除可以随时更改的字符串部分。 This makes it difficult to split the string to remove said section.
这使得很难拆分字符串以移除所述部分。 There is a point before and after the section to remove that is constant.
在要删除的部分之前和之后有一个点是常数。
Here is the only way I can think of to accurately show an example (please ignore the fact that it is html):这是我能想到的准确显示示例的唯一方法(请忽略它是html的事实):
string text =
"<ul>
<li>keep this text</li>
<li class=Known unknown text </li>
<li>keep this text</li>
</ul>";
string [] splitPerams = {"","<li class=Known (im guessing a regex here)
</li>"}
string [] results =
text.Split(splitPerams,System.StringSplitOptions.RemoveEmptyEntries);
output:输出:
"<ul>
<li>keep this text</li>
<li>keep this text</li>
</ul>";
I know there are a lot of similar questions regarding this subject, but all of them are in different languages, and I cant figure out how to implement the logic in c#.我知道有很多关于这个主题的类似问题,但它们都是不同的语言,我无法弄清楚如何在 c# 中实现逻辑。
EDIT:I guess I'm not allowed to delete this so I will do my best to just reword it completely for better understanding.编辑:我想我不允许删除它,所以我会尽我所能完全改写它以便更好地理解。
It sounds like what you need isn't a split so much as the front end of a string so using substring
should do it.听起来您需要的不是分割,而是字符串的前端,因此使用
substring
应该可以做到。 Since you know what characters the removing section starts with, using indexOf
will be useful.由于您知道删除部分以什么字符开头,因此使用
indexOf
将很有用。
var str = "Hi My name is Mr. ???? from the usa.";
var newStr = str.Substring(0, str.IndexOf("Mr."));
Play around with that to get the exact length you want.玩弄它以获得您想要的确切长度。
References:参考:
https://docs.microsoft.com/en-us/dotnet/api/system.string.substring?view=netframework-4.7.2 https://docs.microsoft.com/en-us/dotnet/api/system.string.substring?view=netframework-4.7.2
https://docs.microsoft.com/en-us/dotnet/api/system.string.indexof?view=netframework-4.7.2 https://docs.microsoft.com/en-us/dotnet/api/system.string.indexof?view=netframework-4.7.2
If by some chance this helps someone, here is the way to remove/pull an unknown section of text from a string when you know the part before and after the unknown section.如果这对某人有帮助,那么当您知道未知部分之前和之后的部分时,这是从字符串中删除/拉出未知文本部分的方法。
string originalText = "Hi my name is Mr. Smith from the USA.";
string[] topPull = { "", "Mr." };
string[] bottomPull = { "from", "" };
string result;
string[] topPage = originalText.Split(topPull,StringSplitOptions.RemoveEmptyEntries);
string[] bottomPage =
originalText.Split(bottomPull,StringSplitOptions.RemoveEmptyEntries);
//topPage[0] gives all text above topPull, but not topPull it's self
//bottomPull[1] gives all text below bottomPull, but not bottomPull it's self
//now that we have grabbed all the text above and below our known sections we need to
//add in the known sections themselves, ie topPull and bottomPull
result = topPage[0] + topPull[1] + " " + bottomPull[0] + bottomPage[1];
output: "Hi my name is Mr. from the USA."输出:“嗨,我的名字是来自美国的先生。”
If you want to keep only the middle text you can do it this way如果你只想保留中间文本,你可以这样做
string originalText = "Hi my name is Mr. Smith from the USA.";
string[] topPull = { "", "Mr." };
string[] bottomPull = { "from", "" };
string result;
string[] topPage = originalText.Split(topPull,StringSplitOptions.RemoveEmptyEntries);
string[] bottomPage =
topPage[1].Split(bottomPull,StringSplitOptions.RemoveEmptyEntries);
result = bottomPage[0];
output: " Smith ";输出:“史密斯”;
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