blocks|key|2134760|text|这是另一条可能的路线。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2134761|你可以通过“从”和“到”分开。每个部分都是为您创建的：|2134762|var+str+=+"get+directions+from+Sydney+to+Melbourne";

var+parts+=+str.Split(new+string[]+{+"from",+"to"+},+StringSplitOptions.None);+//+split+it+up
var+from+=+parts[1];+//+index+1+is+from
var+to+=+parts[2];+++//+index+2+is+to

Console.WriteLine(from);+//+"Sydney"
Console.WriteLine(to);+++//+"Melbourne"|code-block|syntax|javascript|2134763|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Here's another possible route (lolpun)..

You can split via "from" and "to". Each part is created for you then:

<pre><code>var str = "get directions from Sydney to Melbourne";

var parts = str.Split(new string[] { "from", "to" }, StringSplitOptions.None); // split it up
var from = parts[1]; // index 1 is from
var to = parts[2]; // index 2 is to

Console.WriteLine(from); // "Sydney"
Console.WriteLine(to); // "Melbourne"
</code></pre>

blocks|key|1081243|text|传递给子字符串方法的第二个参数是从实例字符串中提取的字符数，而不是另一个位置|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1081244|String+fromDestination+=+InputTextbox.Text;
int+pos+=+fromDestination.IndexOf("+from+");
if(pos+>=+0)
{
+++int+pos2+=+fromDestination.IndexOf("+to+",+pos);
+++if(pos2+>+-1)
+++{
++++++int+len+=+pos2+-+(pos+%2B+6);
++++++fromDestination+=+fromDestination.Substring(pos%2B6,+len);

+++}
}|code-block|syntax|javascript|1081245|注意，我已经更改了搜索字符串，在from和to之前和之后添加了一个空格。这是一种预防措施，以避免在城市名称中包含“to”作为其名称的一部分时，或者如果在实际启动from之前文本中嵌入了另一个from，则避免出现误报。|offset|length|style|CODE|1081246|entityMap^0|0|0|G|4|L|2|28|4|2N|4|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]|$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|N|$]]

The second parameter to pass to the Substring method is the number of chars to extract from the instance string, not another position

<pre><code>String fromDestination = InputTextbox.Text;
int pos = fromDestination.IndexOf(" from ");
if(pos &gt;= 0)
{
 int pos2 = fromDestination.IndexOf(" to ", pos);
 if(pos2 &gt; -1)
 {
 int len = pos2 - (pos + 6);
 fromDestination = fromDestination.Substring(pos+6, len);

 }
}
</code></pre>

Notice that I have changed the search strings adding a space before and after <code>from</code> and <code>to</code>. This is a precautional measure required to avoid false positives when a city name contains 'to' as part of its name or if there is another <code>from</code> embedded in the text before the actual starting <code>from</code>

blocks|key|2134801|text|如果字符串总是相同的，我建议使用一个简单的字符串拆分。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2134802|string+fromDestination+=+InputTextbox.Text.Split('+')[3];|offset|length|style|CODE|2134803|entityMap^0|0|0|1L|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

If the string is always the same I would suggest a simple string split.

<code>string fromDestination = InputTextbox.Text.Split(' ')[3];</code>

blocks|key|1081217|text|Substring(startIndex,+length)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1081218|对于计算长度，您应该尝试fromDestination.Length+-+fromDestination.IndexOf("+to+")|unstyled|offset|length|style|CODE|1081219|fromDestination.Substring(fromDestination.IndexOf("+from+")+%2B+5,+fromDestination.Length+-+fromDestination.IndexOf("+to+"));|1081220|entityMap^0|0|C|1K|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|P|8|@$G|Q|H|R|I|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|M|3|-4|5|F|7|T|8|@]|9|@]|A|$]]]|N|$]]

<pre><code>Substring(startIndex, length)
</code></pre>

for compute the length you should try to <code>fromDestination.Length - fromDestination.IndexOf(" to ")</code>

<pre><code>fromDestination.Substring(fromDestination.IndexOf(" from ") + 5, fromDestination.Length - fromDestination.IndexOf(" to "));
</code></pre>

blocks|key|2134847|text|还可以使用正则表达式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2134848|String+fromDestination+=+"get+directions+from+Sydney+to+Melbourne";
var+match+=+Regex.Match(fromDestination,+@"(?<=from\s).*(?=\sto)");
if+(match.Groups.Count+>+0)
++++fromDestination+=+match.Groups[0].Value;|code-block|syntax|javascript|2134849|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can also use regular expressions:

<pre><code>String fromDestination = "get directions from Sydney to Melbourne";
var match = Regex.Match(fromDestination, @"(?&lt;=from\s).*(?=\sto)");
if (match.Groups.Count &gt; 0)
 fromDestination = match.Groups[0].Value;
</code></pre>

blocks|key|2166195|text|这会让你得到“悉尼墨尔本”的字符串：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2166196|string+fromDestination+=+"get+directions+from+Sydney+to+Melbourne";
string+result+=+fromDestination.Substring(fromDestination.IndexOf("from")+%2B+5).Replace("to",+"");|code-block|syntax|javascript|2166197|从外观上看，您最好将textbox替换为2个组合框，每个组合框的项目都由可用城市的预定义列表填充，这样用户就不能输入任何类型的输入，您只需对组合框的选择索引作出反应……|2166198|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This will get you the string "Sydney Melbourne":

<pre><code>string fromDestination = "get directions from Sydney to Melbourne";
string result = fromDestination.Substring(fromDestination.IndexOf("from") + 5).Replace("to", "");
</code></pre>

By the look you probably would be better off replacing the textbox for 2 comboboxes,each with their items filled by a predefined list of available cities so the user cannot enter any typos for example and you just react to the selectedindex of the combobox...

I'm using C#, and have the following string text value:

<pre><code>get directions from Sydney to Melbourne
</code></pre>

And this is the code that I have at the moment to try and get the text that appears between From and To

<pre><code>String fromDestination = InputTextbox.Text;
if (fromDestination.Contains("from"))
{
 fromDestination = fromDestination.Substring(fromDestination.IndexOf("from") + 5, fromDestination.IndexOf("to") - 3);
}
</code></pre>

That code removes the word "from" from the returned value, but I cannot work out how to get ride of the "to". The output at the moment is:
sydney to Melb

Thanks for any help.

SubString Text Selection

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我使用的是C#，并具有以下字符串文本值：get directions from Sydney to Melbourne这是我目前想要得到的代码，它显示在“从”到“到”之间。String fromDestination = InputTextbox.Text;if (fromDestination.Contains("from")){   fromDestination = fromDestinat

问SubString文本选择
EN

回答 6

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