Replace value dynamically with regular expression

Question

I have a url like

http://www.somesite.com/$(someKey).php

I have a dictionary includes these keys, what I need is using the Regex to replace the $(*) with the value in the dictionary labeled with that key.

How can I do that?

@AlexFilipovici I know I should use it, but I don't know the patterns needed, and how to get the key from the input string. — Abdallah Nasir
– Abdallah Nasir, Commented Jul 15, 2013 at 9:15

Alex Filipovici · Accepted Answer · 2013-07-15 09:39:10Z

3

You may use the Regex.Replace Method. Try this:

class Program
{
    static void Main(string[] args)
    {
        var dict = new Dictionary<string, string>();
        dict.Add("someKey1", "MyPage1");
        dict.Add("someKey2", "MyPage2");

        var input = "http://www.somesite.com/$(someKey2).php";
        var output = Regex.Replace(input, @"\$\((.*?)\)", m => 
        {
            return dict[m.Groups[1].Value];
        });
    }
}

edited Jul 15, 2013 at 9:39

answered Jul 15, 2013 at 9:16

Alex Filipovici

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3 Comments

Cristian Lupascu Over a year ago

the pattern should be \$$.*?$ - otherwise the match for .* is greedy and there are going to be problems for cases with 2 or more possible matches.

Abdallah Nasir Over a year ago

Thanks, that worked fine, but the key should not include the $() characters, Thanks any way :)

Alex Filipovici Over a year ago

You are welcome. It was a little bit unclear in the OP how the keys in the dictionary would look like... I updated my answer with the proper replacement code.

Casimir et Hippolyte · Accepted Answer · 2013-07-15 09:27:47Z

2

a thing like this perhaps:

url = Regex.Replace(url , @"\$\(([^)]+)\)", delegate(Match m){ return dict[m.Groups[1]]; });

edited Jul 15, 2013 at 9:27

answered Jul 15, 2013 at 9:21

Casimir et Hippolyte

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