using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(http:\/\/example\.com\/.*?\/.*?\/.*?)\.png";
string substitution = @"$1.jpg";
string input = @"bunch_of_text#http://example.com/images/XX/YY/filename.png#bunch_of_text%%more_text""http://example.com/2016/10/26001140/blah.png@@more_text";
Regex regex = new Regex(pattern);
string result = regex.Replace(input, substitution);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx