Need to replace a string C#

Question

I need to replace:

string input = "%someAlphabets%.ZIP"
string replaceWith = "Hello"
string result = "Hello.ZIP"

I tried with Regex.Replace(inputString,"[%][A-Za-z][%]", replacedWith); but it is not working.

Answer 1

The problem in your expression is that, there is only one alphabet in between % signs. You need to repeat the alphabets.

Regex.Replace(inputString,"[%][A-Za-z]{1,}[%]", replacedWith);

Answer 2

Try this:

string input= "%someAlphabets%.ZIP"
string regex = "(%.*%)";
string result = Regex.Replace(input, regex, "Hello");

It doesn't care if the name is alphabet only but that you can change by changing the .* caluse to your selection logic.

Answer 3

As already mentioned in the comments, you don't need RegEx for this.

More simpler alternatives may be:

1. Using string.Format

string.Format("{0}", input)`

2. Using string interpolation

var input = "Hello";
var result = $"{input}.zip";

3. Using string.Replace method

var input = "%pattern%.ZIP"
var with = "Hello"
var result = input.Replace("%pattern%", with);