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copied!<p>Here's what I would do:</p> <pre><code>String raw = new String(node); // might be a better way to get a string from the chars int slashPos = raw.indexOf('\\'); if(slashPos >= 0) { String hex = raw.substring(slashPos + 1); int value = Integer.parseInt(hex,16); } </code></pre> <p>In this manner, we're not special casing anything for 2, 3, 4, or 100 digits (although I'm sure 100 digits would throw an exception :-) ). Instead, we're using the protocol as a 'milestone' in the string, and then just accepting that everything after the slash is the hex string.</p> <pre><code>class HexParse { private static class HexResult { final boolean exists; final int value; HexResult(boolean e, int v) { exists = e; value = v; } } private final String raw; private final HexResult result; public HexParse(String raw) { this.raw = raw; int slashPos = raw.indexOf('\\'); boolean noSlash = slashPos < 0; boolean noTextAfterSlash = slashPos > raw.length() - 2; if(noSlash || noTextAfterSlash) { result = new HexResult(false,0); } else { // throws exception if second part of string contains non-hex chars result = new HexResult(true,Integer.parseInt(raw.substring(slashPos + 1),16)); } } public String toString() { StringBuilder sb = new StringBuilder(); sb.append(raw).append(" "); if(result.exists) { sb.append("has hex of decimal value ").append(result.value); } else { sb.append("has no hex"); } return sb.toString(); } public static void main(String...args) { System.out.println(new HexParse("test`hello")); // none System.out.println(new HexParse("haha\\abcdef")); // hex System.out.println(new HexParse("good\\f00d")); // hex System.out.println(new HexParse("\\84b")); // hex System.out.println(new HexParse("\\")); // none System.out.println(new HexParse("abcd\\efgh")); //exception } } c:\files\j>javac HexParse.java c:\files\j>java HexParse test`hello has no hex haha\abcdef has hex of decimal value 11259375 good\f00d has hex of decimal value 61453 \84b has hex of decimal value 2123 \ has no hex Exception in thread "main" java.lang.NumberFormatException: For input string: "e fgh" at java.lang.NumberFormatException.forInputString(NumberFormatException. java:48) at java.lang.Integer.parseInt(Integer.java:458) at HexParse.<init>(HexParse.java:21) at HexParse.main(HexParse.java: </code></pre>

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