用<a href> tags

In my ASP.NET application I have a plain text field. I want to allow the user to be able to enter URL's in the following format:用<a href> tags

[url="http://www.google.com"]Google[/url]

These would be saved to a database directly as they were entered. On retrieveal however, I'd like to convert the above into the following HTML format to make it active on-screen:

<a href="http://www.google.com">Google</a>

The reason for this approach is to avoid tampering with the built-in ASP.NET validation routines, which trigger an error when it sees <a in a form input string.

I've seen other examples on StackOverflow where RegEx is used to parse the string, however, I cannot find anything that I can follow where multiple occurrences of [url...] may exist in a single string.

Can anyone please offer me an example of how to parse such a string, say...

Try this funky new search engine: [url="http://www.google.com"]Google[/url] Or this older one from back in the day: [url="http://uk.altavista.com"]AltaVista[/url]

...to convert each occurrence into the desired format? RegEx isn't my strong-point sadly.

Thanks.

來源

2013-05-13 EvilDr

幾乎類似的問題，我回答[在正則表達式聊天室]（http://chat.stackoverflow.com/transcript/message/9370083#9370083），但在PHP中。如果在ASP中有類似的功能，你可以用'url'和輸出替換'size' ......另外我認爲有一個錯字'Google' I think you meant 'Google'。 – HamZa 2013-05-13 09:44:25

嗨。謝謝是的，有一個錯字糾正。至於RegEx，在VB.NET中它不會返回匹配。不知道是否雙引號會干擾（這是VB.NET中的字符串符號），因此如果有意義的話，您可以使用雙雙引號在字符串中返回單個雙引號？ 'Dim r As New Regex（「/ \ [url \ s？= \ s？」「？（。*？）」「？\]（。*？）\ [\/url \]/s」）' – EvilDr 2013-05-13 10:06:21

我不熟悉VB.net或ASP，這裏是[在線測試人員]（http://i.stack.imgur.com/L2eL5.jpg）的屏幕截圖，你可以加入我們的[正則表達式室]（ http://chat.stackoverflow.com/rooms/25767/regex）。 – HamZa 2013-05-13 10:31:28

As I understood, you need a BBCode converter for ASP.NET, which you can find here替換自定義標籤。從給定鏈路

例子：

string BBCodeSyntax = "[url={webaddress}]{display}[/url]"; 
string HtmlSyntax = "<a href=\"{webaddress}\">{display}</a>"; 
string Fields = "{webaddress};{display}"; 

string input = "For those who code - [url=http://www.codeproject.com]The CodeProject[/url]. This website contains lots of articles about programming. For open source project hosting from Microsoft, you may have a look at [url=http://www.codeplex.com]Codeplex.com[/url]."; 

string output = BBCode.ConvertToHtml(input, BBCodeSyntax, HtmlSyntax, Fields); 
return output;

來源

2013-05-13 08:52:02 Epsil0neR

嗨。我明白了，並且還看到了Jeff Atwood的Markdown NuGet軟件包，它模仿了StackOverflow的編輯器。然而，每個人都有他們自己的問題（BBCode使用的iFrames不好），所以我希望儘可能使用本機ASP.NET功能，例如。在BBCodeSyntax中的RegEx – EvilDr 2013-05-13 09:17:32

中，您給出了自定義BBCode的語法，在HTMLSytax中，您提供了自定義HTML語法，您可以在其中編寫iframe，但是在給定示例中，html語法只是簡單鏈接，僅用於顯示href屬性和文本。 – Epsil0neR 2013-05-13 09:46:04

繼哈姆扎DzCyberDeV的意見，我用正則表達式中RegexHero，發現RegExHero甚至產生了ASP.NET。因此究竟下面的簡單代碼實現了我所需要的結果：

Dim s As String = txt_input.Text.Trim 
Dim strRegex As String = "\[url\s?=\s?""?(.*?)""?\](.*?)\[\/url\]" 
Dim myRegex As New Regex(strRegex) 
Dim strReplace As String = "<a href=""$1"">$2</a>" 
ltl_output.Text = myRegex.Replace(s, strReplace)

來源

2013-05-13 13:43:55 EvilDr

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