Question

I have large text. I need to find an URL and replace the found text with another text.

Here is an example:

http://cdn.example.com/content/dev/images/some.png
http://cdn.example.com/content/qa/images/some.png
http://cdn.example.com/content/preprod/images/some.png

to

http://cdn.example.com/content/qa/images/some.png
http://cdn.example.com/content/preprod/images/some.png
http://cdn.example.com/content/live/images/some.png

I need to find url segment and just replace the found segment.
i have the following code:

Regex rxCdnReplace = new Regex(@"http://cdn.example.com/content/(\w+)/", RegexOptions.Multiline | RegexOptions.IgnoreCase);
rxCdnReplace.Replace(str,new MatchEvaluator(CdnRename.ReplaceEvaluator))

How can I do this with regex?

Answer 1

try this regex:

(?<=content\/).+(?=\/images)

It returns the value between content/ and /images

E.g. for the link http://cdn.example.com/content/dev/images/some.png
the regex returns dev which you should replace with qa

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main()
    {
    // This is the input string we are replacing parts from.
    string input = "http://cdn.example.com/content/dev/images/some.png";

    // Use Regex.Replace to replace the pattern in the input.
      string output = Regex.Replace(input, "(?<=content\/).+(?=\/images)", "qa");

    // Write the output.
    Console.WriteLine(input);
    Console.WriteLine(output);
    }
}