diff --git a/src/lang-ietfabnf.js b/src/lang-ietfabnf.js
new file mode 100644
index 00000000..24ad5e7a
--- /dev/null
+++ b/src/lang-ietfabnf.js
@@ -0,0 +1,45 @@
+/**
+ * @license
+ * Copyright (C) 2018 Julian Reschke
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview
+ * Registers a language handler for IETF ABNF, as specified in RFC 5234,
+ * and extended in RFCs 7230 (list production) and 7405 (%s and %i).
+ */
+
+PR['registerLangHandler'](
+    PR['createSimpleLexer'](
+        [
+         // comment
+         [PR['PR_COMMENT'], /^;[^\x00-\x1f]*/, null, ";"],
+        ],
+        [
+         // string literals
+         [PR['PR_STRING'], /^(\%s|\%i)?"[^"\x00-\x1f]*"/, null],
+         // binary literals
+         [PR['PR_LITERAL'], /^\%b[01]+((-[01]+)|(\.[01]+)*)/, null],
+         // decimal literals
+         [PR['PR_LITERAL'], /^\%d[0-9]+((-[0-9]+)|(\.[0-9]+)*)/, null],
+         // hex literals
+         [PR['PR_LITERAL'], /^(\%x[A-Za-z0-9]+((-[A-Za-z0-9]+)|(\.[A-Za-z0-9]+)*))/, null],
+         // prose rule
+         [PR['PR_NOCODE'], /^<[^>\x00-\x1f]*>/, null],
+         // rule name
+         [PR['PR_TYPE'], /^([A-Za-z][A-Za-z0-9-]*)/, null],
+         [PR['PR_PUNCTUATION'], /^[=\(\)\*\/\[\]#]/, null],
+        ]),
+    ['ietf_abnf']);