Merge pull request #9054 from CartoDB/9053-vis-ext

Fix checking for visualization extension

Author: jgoizueta

lib/carto/visualization_exporter.rb

@@ -77,7 +77,7 @@ module VisualizationExporter
     VISUALIZATION_EXTENSIONS = [Carto::VisualizationExporter::EXPORT_EXTENSION].freeze
 
     def self.has_visualization_extension?(filename)
-      VISUALIZATION_EXTENSIONS.any? { |extension| filename =~ /#{extension}$/ }
+      VISUALIZATION_EXTENSIONS.any? { |extension| filename =~ /#{Regexp.escape(extension)}$/ }
     end
 
     def export(visualization, user,