using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
String inputString = @"TextBlock Text=""this is a test""";
String result = Regex.Replace(inputString, @"(?<=TextBlock Text="")[\w\s]+(?="")", "Any given string comes here");
Console.WriteLine(result);
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uVGV4dC5SZWd1bGFyRXhwcmVzc2lvbnM7CgpwdWJsaWMgY2xhc3MgVGVzdAp7CglwdWJsaWMgc3RhdGljIHZvaWQgTWFpbigpCgl7CgogICAgICAgICAgClN0cmluZyBpbnB1dFN0cmluZyA9IEAiVGV4dEJsb2NrIFRleHQ9IiJ0aGlzIGlzIGEgdGVzdCIiIjsKU3RyaW5nIHJlc3VsdCA9IFJlZ2V4LlJlcGxhY2UoaW5wdXRTdHJpbmcsIEAiKD88PVRleHRCbG9jayBUZXh0PSIiKVtcd1xzXSsoPz0iIikiLCAiQW55IGdpdmVuIHN0cmluZyBjb21lcyBoZXJlIik7CkNvbnNvbGUuV3JpdGVMaW5lKHJlc3VsdCk7IAoKCX0KfQ==