Replace string with a HTML tag

Question

I am working on a Regex but its not working fine. My requirement is I have a string value and it has '##Anything##' tags like this. I want to replace this ##Anything## with a asp control

##name## donates a texbox ##Field## donates a combobox and so on

Do you want to create TextBoxes at run-time on a web page, or is this to create the web page during authoring? — Andrew Morton, May 22 '13 at 11:04
I want to create a asp control on runtime , while parsing the string. — Syed Umar Ahmed, May 22 '13 at 11:04

Francis Gagnon · Answer 1 · 2013-05-22T18:53:28.343

The String.Replace approach should work fine and may be the best solution for you. But if you still want a regex solution, you could use something like this:

private const string REGEX_TOKEN_FINDER = @"##([^\s#]+)##"
private const int REGEX_GRP_KEY_NAME = 1;

public static string Format(string format, Dictionary<string, string> args) {
    return Regex.Replace(format, REGEX_TOKEN_FINDER, match => FormatMatchEvaluator(match, args));
}

private static string FormatMatchEvaluator(Match m, Dictionary<string, string> lookup) {
    string key = m.Groups[REGEX_GRP_KEY_NAME].Value;
    if (!lookup.ContainsKey(key)) {
        return m.Value;
    }
    return lookup[key];
}

It works on tokens such as this: ##hello##. The value between the ## are searched for in the dictionary that you provide, remember that the the search in the dictionary is case sensitive. If it is not found in the dictionary, the token is left unchanged in the string. The following code can be used to test it out:

var d = new Dictionary<string, string>();
d.Add("VALUE1", "1111");
d.Add("VALUE2", "2222");
d.Add("VALUE3", "3333");

string testInput = "This is value1: ##VALUE1##. Here is value2: ##VALUE2##. Some fake markers here ##valueFake, here ##VALUE4## and here ####. And finally value3: ##VALUE3##?";

Console.WriteLine(Format(testInput, d));
Console.ReadKey();

Running it will give the following output:

This is value1: 1111. Here is value2: 2222. Some fake markers here ##valueFake, here ##VALUE4## and here ####. And finally value3: 3333?

score 1 · Answer 2 · answered May 22 '13 at 11:00

1

You can do it using String.Replace() method:

//Example Html content
string html ="<html> <body> ##Name## </body> </html>";

 //replace all the tags for AspTextbox as store the result Html
string ResultHtml = html.Replace("##Name##","<asp:Textbox id=\"txt\" Text=\"MyText\" />");

answered May 22 '13 at 11:00

Carlos Landeras

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No but it has different string as well like ##Anything## – Syed Umar Ahmed May 22 '13 at 11:03
Does your tag ##Anything## to create a textbox who contains Anything text? I dont really understand what you need – Carlos Landeras May 22 '13 at 11:04
i edited the question again see ##text## means its a textbox ##Value## means its a dropdown ##anything## so on i have predefined text for the user to insert in a rich text box – Syed Umar Ahmed May 22 '13 at 11:05

score 0 · Answer 3 · answered May 22 '13 at 11:01

0

Again, the best hint is to use string.Replace(), perhaps in combination with string.Substring().

answered May 22 '13 at 11:01

icbytes

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Replace string with a HTML tag

3 Answers3