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Java templates with Markdown and Freemarker
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package com.crivano.jmodel;

import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class FreemarkerMarker {

	static public Pattern patternFMM = Pattern.compile("\\{\\{fm\\}\\}(.*?)\\{\\{\\/fm\\}\\}", Pattern.DOTALL);

	private String template;
	private int pos = 0;
	private int len = 0;

	public FreemarkerMarker(String template) {
		super();
		this.template = template;
		this.len = this.template.length();
	}

	private boolean match(char c, int i) {
		if (pos + i >= len)
			return false;
		return template.charAt(pos + i) == c;
	}

	public String addMarks() {
		StringBuffer sb = new StringBuffer();
		int state = 0;
		while (pos < len) {
			if (match('[', 0)) {
				if (match('#', 1) && match('-', 2) && match('-', 3)) {
					int start = pos;
					skipComment();
					sb.append("{{fm}}");
					sb.append(template.substring(start, pos));
					sb.append("{{/fm}}");
					continue;
				}
				if ((match('#', 1) || match('@', 1)) || (match('/', 1) && (match('#', 2) || match('@', 2)))) {
					int start = pos;
					skipCommand();
					sb.append("{{fm}}");
					sb.append(template.substring(start, pos));
					sb.append("{{/fm}}");
					continue;
				}
			}
			sb.append(template.charAt(pos));
			pos++;
		}
		return sb.toString();
	}

	private void skipComment() {
		while (pos < len) {
			if (match('-', 0) && match('-', 1) && match(']', 2)) {
				pos += 3;
				return;
			}
			pos++;
		}
	}

	private void skipCommand() {
		pos++;
		while (pos < len) {
			if (match('"', 0)) {
				skipStringDoubleQuote();
			}

			if (match('\'', 0)) {
				skipStringSingleQuote();
			}

			if (match('[', 0)) {
				skipBrackets();
			}

			if (match(']', 0)) {
				pos += 1;
				return;
			}
			if (match('/', 0) && match(']', 1)) {
				pos += 2;
				return;
			}
			pos++;
		}
	}

	private void skipStringDoubleQuote() {
		pos++;
		while (pos < len) {
			if (match('"', 0)) {
				pos += 1;
				return;
			}
			if (match('\\', 0) && match('"', 1)) {
				pos += 2;
			}
			pos++;
		}
	}

	private void skipStringSingleQuote() {
		pos++;
		while (pos < len) {
			if (match('\'', 0)) {
				pos += 1;
				return;
			}
			if (match('\\', 0) && match('\'', 1)) {
				pos += 2;
			}
			pos++;
		}
	}

	private void skipBrackets() {
		pos++;
		while (pos < len) {
			if (match('[', 0)) {
				skipBrackets();
			}

			if (match(']', 0)) {
				pos += 1;
				return;
			}
			pos++;
		}
	}

	public static String removeMarks(String marked) {
		Matcher matcher = patternFMM.matcher(marked);
		StringBuffer output = new StringBuffer();
		while (matcher.find()) {
			String ftl = matcher.group(1);
			matcher.appendReplacement(output, ftl);
		}
		matcher.appendTail(output);
		return output.toString();
	}
	
	public static String quote(String s) {
		if (s == null)
			return null;
		return s.replace("$", "|dollar-sign|");
	}

	public static String unquote(String s) {
		if (s == null)
			return null;
		return s.replace("|dollar-sign|", "$");
	}

}