using System;
using System.Linq;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
var str = "Test123(45) and More (5 numbers inside parentheses 123)";
var result = Regex.Replace(str, @"\([^()]+\)", m => Regex.Replace(m.Value, @"\d+", string.Empty));
Console.WriteLine(result);
}
}
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