diff --git a/_contrib/updatetx.rb b/_contrib/updatetx.rb
index 14462cbae6..1c8c93f6fd 100755
--- a/_contrib/updatetx.rb
+++ b/_contrib/updatetx.rb
@@ -28,11 +28,11 @@ def prompt(*args)
     next if file == '.' or file == '..'
     contents = File.read(dir + '/' + file)
     # Drop HTML code applied to current language only ( until next {% when / else / endcase %} statement )
-    contents.gsub!(Regexp.new("{% when '" + lang + "' %}((?!.*?{% endcase %})(?!.*?{% else %}).)*?{% when", Regexp::MULTILINE),'{% when')
-    contents.gsub!(Regexp.new("{% when '" + lang + "' %}((?!.*?{% endcase %}).)*?{% else %}", Regexp::MULTILINE),'{% else %}')
+    contents.gsub!(Regexp.new("{% when '" + lang + "' %}((?!{% endcase %})(?!.*?{% else %}).)*?{% when", Regexp::MULTILINE),'{% when')
+    contents.gsub!(Regexp.new("{% when '" + lang + "' %}((?!{% endcase %}).)*?{% else %}", Regexp::MULTILINE),'{% else %}')
     contents.gsub!(Regexp.new("{% when '" + lang + "' %}.*?{% endcase %}", Regexp::MULTILINE),'{% endcase %}')
     # Drop complete {% case / endcase %} statements when not used by any language anymore
-    contents.gsub!(Regexp.new("{% case page.lang %}(((?!{% when ).)*?){% else %}(.*?){% endcase %}", Regexp::MULTILINE),'\1 \3')
+    contents.gsub!(Regexp.new("{% case page.lang %}(((?!{% endcase %})(?!{% when ).)*?){% else %}(.*?){% endcase %}", Regexp::MULTILINE),'\1 \3')
     contents.gsub!(Regexp.new("{% case page.lang %}(((?!{% when ).)*?){% endcase %}", Regexp::MULTILINE),'\1')
     # Drop language in statements applied to many languages ( e.g. {% when 'ar' or 'fr' .. %} )
     contents.gsub!(Regexp.new("{% when '" + lang + "' or (.*?) %}"),'{% when \1 %}')