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VB.Net/C# BBCode Function

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VB.Net/C# BBCode Function Code Bank forum containing sample code and scripts to help solve common problems. Take a look and use the code to assist in your projects.

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  #1  
Old October 19th, 2007, 12:44 PM
jmurrayhead jmurrayhead is offline
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VB.Net/C# BBCode Function
I've looked all over the net for something like this for ASP.Net and couldn't find what I needed. After reviewing several pages, I was able to use individual pieces of information to build this simple regular expression to parse BBCode into HTML.

I thought something like this would be really long and complicated, but it's not at all:

VB.Net Code:
Original - VB.Net Code 
  1.  
  2.     Public Function BBCode(ByVal strTextToReplace As String) As String
  3.  
  4.         '//Define regex
  5.         Dim regExp As Regex
  6.  
  7.         '//Regex for URL tag without anchor
  8.         regExp = New Regex("\[url\]([^\]]+)\[\/url\]")
  9.         strTextToReplace = regExp.Replace(strTextToReplace, "<a href=""$1"">$1</a>")
  10.  
  11.         '//Regex for URL with anchor
  12.         regExp = New Regex("\[url=([^\]]+)\]([^\]]+)\[\/url\]")
  13.         strTextToReplace = regExp.Replace(strTextToReplace, "<a href=""$1"">$2</a>")
  14.  
  15.         '//Image regex
  16.         regExp = New Regex("\[img\]([^\]]+)\[\/img\]")
  17.         strTextToReplace = regExp.Replace(strTextToReplace, "<img src=""$1"" />")
  18.         
  19.         '//Bold text
  20.         regExp = New Regex("\[b\](.+?)\[\/b\]")
  21.         strTextToReplace = regExp.Replace(strTextToReplace, "<b>$1</b>")
  22.  
  23.         '//Italic text
  24.         regExp = New Regex("\[i\](.+?)\[\/i\]")
  25.         strTextToReplace = regExp.Replace(strTextToReplace, "<i>$1</i>")
  26.  
  27.         '//Underline text
  28.         regExp = New Regex("\[u\](.+?)\[\/u\]")
  29.         strTextToReplace = regExp.Replace(strTextToReplace, "<u>$1</u>")
  30.         
  31.         '//Font size
  32.         regExp = New Regex("\[size=([^\]]+)\]([^\]]+)\[\/size\]")
  33.         strTextToReplace = regExp.Replace(strTextToReplace, "<span style=""font-size: $1px"">$2</span>")
  34.         
  35.         '//Font color
  36.         regExp = New Regex("\[color=([^\]]+)\]([^\]]+)\[\/color\]")
  37.         strTextToReplace = regExp.Replace(strTextToReplace, "<span style=""color: $1"">$2</span>")
  38.         
  39.         Return strTextToReplace
  40.     End Function


C# Code:
Original - C# Code 
  1.  
  2. public string BBCode(string strTextToReplace) 
  3. { 
  4.     
  5.     ////Define regex 
  6.     Regex regExp; 
  7.     
  8.     ////Regex for URL tag without anchor 
  9.     regExp = new Regex(@"\[url\]([^\]]+)\[\/url\]"); 
  10.     strTextToReplace = regExp.Replace(strTextToReplace, "<a href=\"$1\">$1</a>"); 
  11.     
  12.     ////Regex for URL with anchor 
  13.     regExp = new Regex(@"\[url=([^\]]+)\]([^\]]+)\[\/url\]"); 
  14.     strTextToReplace = regExp.Replace(strTextToReplace, "<a href=\"$1\">$2</a>"); 
  15.     
  16.     ////Image regex 
  17.     regExp = new Regex(@"\[img\]([^\]]+)\[\/img\]"); 
  18.     strTextToReplace = regExp.Replace(strTextToReplace, "<img src=\"$1\" />"); 
  19.     
  20.     ////Bold text 
  21.     regExp = new Regex(@"\[b\](.+?)\[\/b\]"); 
  22.     strTextToReplace = regExp.Replace(strTextToReplace, "<b>$1</b>"); 
  23.     
  24.     ////Italic text 
  25.     regExp = new Regex(@"\[i\](.+?)\[\/i\]"); 
  26.     strTextToReplace = regExp.Replace(strTextToReplace, "<i>$1</i>"); 
  27.     
  28.     ////Underline text 
  29.     regExp = new Regex(@"\[u\](.+?)\[\/u\]"); 
  30.     strTextToReplace = regExp.Replace(strTextToReplace, "<u>$1</u>"); 
  31.     
  32.     ////Font size
  33.     regExp = new Regex(@"\[size=([^\]]+)\]([^\]]+)\[\/size\]");
  34.     strTextToReplace = regExp.Replace(strTextToReplace, "<span style=\"font-size: $1px\">$2</span>"); 
  35.     
  36.     ////Font color
  37.     regExp = new Regex(@"\[color=([^\]]+)\]([^\]]+)\[\/color\]");
  38.     strTextToReplace = regExp.Replace(strTextToReplace, "<span style=\"color: $1\">$2</span>");               
  39.     
  40.     return strTextToReplace; 
  41. }


This uses block brackets to define the BBCode. For example, if you wanted to place a URL on your page, you would write it like this:

[ url=http://forums.aspfree.com]ASP Free Forums[/ url] (without the spaces in the brackets).

You can easily adapt it with other BBCode if you understand Regex. I'll add more examples as I get time.

Note: C# isn't my native language So, if you find an error in the above C# code, let me know and I'll fix it.

Quote:
Originally Posted by UPDATES
I found a bug in the function already . When using nested BBCode, it won't always work. For example, entering:

[b ][i ]Testing[/i ][/b ]

Will place the item in italics, but will actually write the [b ][/ b] tags.

However, when doing this:

[i ][b ]Testing[/b ][/i ]

The text will be bold and italic. I will look into this when I get some time.

[UPDATE]
Okay, everyone. I fixed the above problem. I had to change up the regular expression for the bold, italic and underline BBCode. Everything appears to be working now. I've updated the files in the attachment, as well.

[UPDATE]
I've added more BBCodes to the above functions and have updated the attachment with these new BBCodes as well.

[UPDATE]
elijathegold showed me a way to make the regular expression easier to read for C#. Files are now updated to represent this
Attached Files
File Type: zip BBCodeSample_Csharp.zip (995 Bytes, 281 views)
File Type: zip BBCodeSample_VB.zip (998 Bytes, 201 views)
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Last edited by jmurrayhead : November 15th, 2007 at 09:53 AM. Reason: added samples
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  #2  
Old October 19th, 2007, 01:25 PM
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Do you have a functioning prototype that can be tested?
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Old October 19th, 2007, 01:33 PM
jmurrayhead jmurrayhead is offline
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Quote:
Originally Posted by Memnoch
Do you have a functioning prototype that can be tested?

I just attached a quick sample to my original post. Very basic, but does the job
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