使用正则表达式在两个特殊字符之间获取字符串 [英] Fetch string between two special character using regex

问题描述

有字符串

-aaa-bbb-ccc-ddd-eee-fff-ggg-hhh-iii-jjj-kkk-lll-



我想使用正则表达式在 - 这个特殊字符之间取字符串。



我使用了以下代码;这是代码片段。

正则表达式r =新正则表达式（@ - （。+？） - ）; 
 MatchCollection mc = r.Matches（name）; 

但它不起作用。请帮我解决这个问题。

提前谢谢。

解决方案

从我的观点来看，使用正则表达式是一种工程矫枉过正。事实上，正则表达式是针对字符串的复杂操作而设计的，并且在分隔符（或特殊字符，在您调用它）之间获取文本不被视为复杂操作。所有主要框架（基本上99％的所有语言）都提供了一个字符串类，它还提供了一种通过分隔符分割字符串的方法。

在C＃中，你可以在下面实现你想要的方式：

 使用系统; 
 
  public   class  SplitTest {
  public   static   void  Main（）{
 
  string  yourString =    -  aaa-bbb-ccc- ddd-eee-fff-ggg-hhh-iii-jjj-kkk-lll  -  
 
  string  [] split = words.Split（ new  Char [] {'   - ' }，StringSplitOptions.RemoveEmptyEntries）;  //  设置分隔符列表，空条目（）是已移除 
 
  foreach （ string  s  in  split）{
 Console.WriteLine（s）; 
} 
} 
} 
  //  该示例显示以下内容输出到控制台： 
  //   aaa  
  //   bbb  
  //  < span class =code-comment> ccc  
  //   ddd  
  //   eee  
  //   fff  
  //   ggg  
  //   hhh  
  //   jjj  
  //   kkk  
  //   lll  

（小于？=  - ）（？=  - ）[A-ZA-Z] + 

try @ - ？（。+？） - 所以patern可以重叠

There is the string
-aaa-bbb-ccc-ddd-eee-fff-ggg-hhh-iii-jjj-kkk-lll-

I want to fetch string between "-" this special character using regex.

I've used this following code; here is the code snippet.

Regex r = new Regex(@"-(.+?)-");
MatchCollection mc = r.Matches(name);

But it's not working. Please help me to solve this.
Thanks in advance.

解决方案

From my point of view, using a regular expression is an engineering overkill. Fact is that regular expressions were designed for complex operations on strings, and getting the text between a separator (or "special character", as you call it) is not considered a complex operation. All of the major frameworks which (basically 99% of all languages) provide a string class also provide a method to split a string by a separator.
In C#, you can achieve what you want in the following way:

using System;

public class SplitTest {
    public static void Main() {

        string yourString= "-aaa-bbb-ccc-ddd-eee-fff-ggg-hhh-iii-jjj-kkk-lll-"

        string [] split = words.Split(new Char [] {'-'}, StringSplitOptions.RemoveEmptyEntries);//set your list of separators, Empty entries ("") are removed

        foreach (string s in split) {
                Console.WriteLine(s);
        }
    }
}
// The example displays the following output to the console:
//       aaa
//       bbb
//       ccc
//       ddd
//       eee
//       fff
//       ggg
//       hhh
//       jjj
//       kkk
//       lll

(?<=-)[a-zA-Z]+(?=-)

try @"-?(.+?)-" so the patern can overlap

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