using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
var text = "ما المجموع:\n1+2";
var result = Regex.Match(text, @"المجموع:\s*(.+)")?.Groups[1].Value;
Console.WriteLine(result);
}
}
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