获取2个字符串之间的字符 [英] Get string between 2 strings

问题描述

我想在两个字符串之间获取字符串。我将用于网址



例如

I want go get string between two strings. I will use for url

For example

dim main as string = "kgjhnbkfm glnvfkdşlv http://ghkng.xfg/ngbf.png gvlkdjg"
dim before as string="http://"
dim after as string = ".png"
dim useless as string='I need to get between theese strings (before and after)
dim urlfinal as string=before+useless+after

推荐答案

使用正则表达式：

Use a Regex:

Dim regex As Regex = New Regex( _
      "(?<=http://).*?(?=\.png)", _
    RegexOptions.Multiline _
    Or RegexOptions.CultureInvariant _
    Or RegexOptions.IgnorePatternWhitespace _
    Or RegexOptions.Compiled _
    )
Dim InputText As String = "kgjhnbkfm glnvfkdşlv http://ghkng.xfg/ngbf.png gvlkdjg"
Dim m As Match = regex.Match(InputText)
If (m.Success) Then
    Console.WriteLine(m.Value)
End If

您可以使用rexex：

Expresso - 用于构建和测试正则表达式的工具 [ ^ ]

制作预先安装的部分。

You could use rexex for this:
Expresso - A Tool for Building and Testing Regular Expressions[^]
MAtch the part that is preseded by and followed by.

我建​​议你看看正则表达式 [ ^ ]。



一个快速的C＃解决方案（也许不是bes因为我的RegExp不如它应该的那么好）：

I would suggest you look at regular expressions[^].

A quick C# solution (maybe not the best as my RegExp is not as good as it should be):

string main = "kgjhnbkfm glnvfkdşlv http://ghkng.xfg/ngbf.png gvlkdjg";
Regex pattern = new Regex("(.*)http://(?<urlfinal>(.*)).png(.*)");

Match match = pattern.Match(main);

string urlFinal = "http://" + match.Groups["urlfinal"].Value + ".png";
</urlfinal>

应该可以轻松转换为VB.NET。

It should be easily convertible to VB.NET.

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