1 files changed, 6 insertions, 2 deletions
diff --git a/lib/json/pure/generator.rb b/lib/json/pure/generator.rb
index 9141ae5..3d5f09f 100644
--- a/lib/json/pure/generator.rb
+++ b/lib/json/pure/generator.rb
@@ -255,8 +255,12 @@ module JSON
         # GeneratorError exception.
         def generate(obj)
           result = obj.to_json(self)
-          if !@quirks_mode && result !~ /\A\s*(?:\[.*\]|\{.*\})\s*\Z/m
-            raise GeneratorError, "only generation of JSON objects or arrays allowed"
+          unless @quirks_mode
+            unless result =~ /\A\s*\[/ && result =~ /\]\s*\Z/ ||
+              result =~ /\A\s*\{/ && result =~ /\}\s*\Z/
+            then
+              raise GeneratorError, "only generation of JSON objects or arrays allowed"
+            end
           end
           result
         end