diff --git a/lib/src/parser.dart b/lib/src/parser.dart
index f709c3c..cc469e1 100644
--- a/lib/src/parser.dart
+++ b/lib/src/parser.dart
@@ -19,15 +19,13 @@ class ExpressionParser {
           .flatten()
           .map((v) => Identifier(v));
 
-  // Parse simple numeric literals: `12`, `3.4`, `.5`.
-  Parser<Literal> get numericLiteral => ((digit() | char('.')).and() &
-              (digit().star() &
-                  ((char('.') & digit().plus()) |
-                          (char('x') & digit().plus()) |
-                          (anyOf('Ee') &
-                              anyOf('+-').optional() &
-                              digit().plus()))
-                      .optional()))
+  // Parse simple numeric literals: `12`, `3.4`, `.5`, `0xAB`.
+  Parser<Literal> get numericLiteral =>
+      ((char('0') & anyOf('xX') & (digit() | anyOf('abcdefABCDEF')).plus()) |
+              (digit() | char('.')).and() &
+                  ((digit().star() & (char('.') & digit().plus()).optional()) &
+                      (anyOf('Ee') & anyOf('+-').optional() & digit().plus())
+                          .optional()))
           .flatten()
           .map((v) {
         return Literal(num.parse(v), v);
diff --git a/test/expressions_test.dart b/test/expressions_test.dart
index d60f804..a6e7d6e 100644
--- a/test/expressions_test.dart
+++ b/test/expressions_test.dart
@@ -19,19 +19,29 @@ void main() {
     });
 
     test('numeric literal', () {
-      for (var v in ['134', '.5', '43.2', '1e3', '1E-3', '1e+0', '0x01']) {
+      for (var v in [
+        '134',
+        '.5',
+        '43.2',
+        '1e3',
+        '1E-3',
+        '1e+0',
+        '.1e2',
+        '1.23e4',
+        '.6e-7',
+        '0x01',
+        '0xD3',
+        '0X1b'
+      ]) {
         var w = parser.numericLiteral.end().parse(v);
         expect(w is Success, isTrue, reason: 'Failed parsing `$v`');
         expect(w.value.value, num.parse(v));
         expect(w.value.raw, v);
       }
 
-      for (var v in [
-        '-134',
-        '.5.4',
-        '1e5E3',
-      ]) {
-        expect(parser.numericLiteral.end().parse(v) is Success, isFalse);
+      for (var v in ['-134', '.5.4', '1e5E3', '5.', '12x34']) {
+        expect(parser.numericLiteral.end().parse(v) is Success, isFalse,
+            reason: 'Expected to fail parsing `$v`');
       }
     });