diff --git a/source/dyaml/scanner.d b/source/dyaml/scanner.d
index c7052c5..7aed9f4 100644
--- a/source/dyaml/scanner.d
+++ b/source/dyaml/scanner.d
@@ -839,6 +839,23 @@ final class Scanner
 
             reader_.sliceBuilder.write(reader_.get(length));
         }
+        void scanAlphaNumericToSlice8(string name)(const Mark startMark)
+            @system pure nothrow @nogc
+        {
+            size_t length = 0;
+            dchar c = reader_.peek();
+            while(c.isAlphaNum || "-_"d.canFind(c)) { c = reader_.peek(++length); }
+
+            if(length == 0)
+            {
+                enum contextMsg = "While scanning " ~ name;
+                error(contextMsg, startMark, expected("alphanumeric, '-' or '_'", c),
+                      reader_.mark);
+                return;
+            }
+
+            reader_.sliceBuilder8.write(reader_.get8(length));
+        }
 
         /// Scan and throw away all characters until next line break.
         void scanToNextBreak() @safe pure nothrow @nogc