Mustache merge class for Salesforce

MergeTool.cls

public class MergeTool {
	
	public static String mustacheMerge(String text, SObject obj) {
		
		String p = '\\{\\{([^\\{\\}]*?)\\}\\}';
		
		Pattern patt = Pattern.compile(p);
		Matcher mat = patt.matcher(text);
		
		Boolean foundValue = mat.find();
		
		if(foundValue) {
			
			do {
				
    			System.debug('GROUP 1: ' + mat.group(1));   			
    			
    			String value;
    			
    			try {
    				value = (String) obj.get(mat.group(1));
    				System.debug('Value: ' + value);
    			} catch (Exception e) {
    				System.debug('Error on ' + mat.group(1));
    				System.debug(e);
    			}
    			
    			if(value != null) {
    				text = text.replaceFirst('\\{\\{' + mat.group(1) + '\\}\\}', value);
    			}
    			
    			foundvalue = mat.find();
    			
			} while (foundvalue);
				
		}
		
		return text;
	}

}

Usage

Lead ld = new Lead(FirstName = 'Kevin', LeadSource = 'Internet');

String test = 'This is {{FirstName}} from the {{LeadSource}}!';

String s = MergeTool.mustacheMerge(test, ld);

System.debug('String: ' + s);