Конвертируем BBCode в HTML: Справочник по C#

public string ConvertBBCodeToHTML (string str)
{
Regex exp;
// format the bold tags: [b][/b]
// becomes: 
exp = new Regex(@"[b](.+?)[/b]");
str = exp.Replace(str, "$1");

// format the italic tags: [i][/i]
// becomes: 
exp = new Regex(@"[i](.+?)[/i]");
str = exp.Replace(str, "$1");

// format the underline tags: [u][/u]
// becomes: 
exp = new Regex(@"[u](.+?)[/u]");
str = exp.Replace(str, "$1");

// format the strike tags: [s][/s]
// becomes: 
exp = new Regex(@"[s](.+?)[/s]");
str = exp.Replace(str, "$1");

// format the url tags: [url=www.website.com]my site[/url]
// becomes: my site
exp = new Regex(@"[url=([^]]+)]([^]]+)[/url]");
str = exp.Replace(str, "$2");

// format the img tags: [img]images/image.jpeg[/img]
// becomes: 
exp = new Regex(@"[img]([^]]+)[/img]");
str = exp.Replace(str, "");

// format img tags with alt: [img=images/image.jpeg]this is the alt text[/img]
// becomes:
exp = new Regex(@"[img=([^]]+)]([^]]+)[/img]");
str = exp.Replace(str, "");

//format the colour tags: [color=red][/color]
// becomes: 
// supports UK English and US English spelling of colour/color
exp = new Regex(@"[color=([^]]+)]([^]]+)[/color]");
str = exp.Replace(str, "$2");
exp = new Regex(@"[colour=([^]]+)]([^]]+)[/colour]");
str = exp.Replace(str, "$2");

// format the size tags: [size=3][/size]
// becomes: 
exp = new Regex(@"[size=([^]]+)]([^]]+)[/size]");
str = exp.Replace(str, "$2");

// lastly, replace any new line characters with

str = str.Replace("rn", "
rn");

return str;
}

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