using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
    	var input = " exec [exec]\n[ exec]\nexec\nexec \nexec   \nexec\n       exec \n(exec\nexec)\n(exec)"; 
    	var result = Regex.Replace(input, @"(\[[^][]*])|\bexec\b",
       			m => m.Groups[1].Success ? m.Groups[1].Value : "EXECUTE");
        Console.WriteLine(result);
	}
}

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