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copied!<p>I recently discovered <a href="http://juel.sourceforge.net/" rel="nofollow">JUEL</a> which fits the description nicely. It is the expression language taken out of JSP. It claims to be very fast, too.</p> <p>I'm about to try it out in one of my own projects.</p> <p>But for a lighter-weight, which is a variant of yours, try this (wrapped in a unit test):</p> <pre><code>public class TestInterpolation { public static class NamedFormatter { public final static Pattern pattern = Pattern.compile("#\\{(?<key>.*)}"); public static String format(final String format, Map<String, ? extends Object> kvs) { final StringBuffer buffer = new StringBuffer(); final Matcher match = pattern.matcher(format); while (match.find()) { final String key = match.group("key"); final Object value = kvs.get(key); if (value != null) match.appendReplacement(buffer, value.toString()); else if (kvs.containsKey(key)) match.appendReplacement(buffer, "null"); else match.appendReplacement(buffer, ""); } match.appendTail(buffer); return buffer.toString(); } } @Test public void test() { assertEquals("hello world", NamedFormatter.format("hello #{name}", map("name", "world"))); assertEquals("hello null", NamedFormatter.format("hello #{name}", map("name", null))); assertEquals("hello ", NamedFormatter.format("hello #{name}", new HashMap<String, Object>())); } private Map<String, Object> map(final String key, final Object value) { final Map<String, Object> kvs = new HashMap<>(); kvs.put(key, value); return kvs; } } </code></pre> <p>I'd extend it to add convenience methods to for quick key-value pairs</p> <pre><code>format(format, key1, value1) format(format, key1, value1, key2, value2) format(format, key1, value1, key2, value2, key3, value3) ... </code></pre> <p>And it shouldn't be too hard to convert from java 7+ to java 6-</p>

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