using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		string input = @"{b sub}{b or}{b di}{b nate} def1...
{b sub}{b tro}{b pi}{b cal} def2...
{b su}{b per} def3...
{b sum} def4... ";
		string result = Regex.Replace(input, @"(?:\{b\s+[^{}]*})+", m =>
			"'" + Regex.Replace(m.Value, @"\{b\s+([^{}]*)}", "$1") + "':");
       	Console.WriteLine(result);
	}
}

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