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diff --git a/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/asm/editor/rules/AsmNumberRule.java b/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/asm/editor/rules/AsmNumberRule.java
new file mode 100644
index 00000000..728030dc
--- /dev/null
+++ b/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/asm/editor/rules/AsmNumberRule.java
@@ -0,0 +1,59 @@
+package net.mograsim.plugin.asm.editor.rules;
+
+import org.eclipse.core.runtime.Assert;
+import org.eclipse.jface.text.rules.ICharacterScanner;
+import org.eclipse.jface.text.rules.IRule;
+import org.eclipse.jface.text.rules.IToken;
+import org.eclipse.jface.text.rules.Token;
+
+import net.mograsim.plugin.asm.AsmNumberUtil;
+
+public class AsmNumberRule implements IRule
+{
+
+	/** The token to be returned when this rule is successful */
+	protected IToken fToken;
+
+	/**
+	 * Creates a rule which will return the specified token when a numerical sequence is detected.
+	 *
+	 * @param token the token to be returned
+	 */
+	public AsmNumberRule(IToken token)
+	{
+		Assert.isNotNull(token);
+		fToken = token;
+	}
+
+	@Override
+	public IToken evaluate(ICharacterScanner scanner)
+	{
+		int i = 1;
+		int c = scanner.read();
+		if (!AsmNumberUtil.isStart(c))
+			return abort(scanner, i);
+		StringBuilder sb = new StringBuilder();
+		sb.appendCodePoint(c);
+		while (true)
+		{
+			c = scanner.read();
+			i++;
+			if (AsmNumberUtil.isPart(c))
+				sb.appendCodePoint(c);
+			else
+				break;
+		}
+		if (!AsmNumberUtil.isNumber(sb))
+			return abort(scanner, i);
+		scanner.unread();
+		return fToken;
+	}
+
+	private static IToken abort(ICharacterScanner scanner, int i)
+	{
+		for (int j = 0; j < i; j++)
+			scanner.unread();
+		return Token.UNDEFINED;
+	}
+
+}