For some reason, it stopped working 2-3 months ago and I cannot debug anything. Even when I try to test the very few steps of my pipe I get "preview failed" and "internal server error". I copied one of the step of the pipe to another pipe and I could get the preview.
Is there something wrong related to my pipe internally? Everything taken independently works, but the whole pipe is crashing on the server side.
your pipe looks like it's working now...
btw, instead of using regex modules just for adding something in front, use loop+string builder. Using regex for that is like using a tank to do a sprint. It will reduce your runtime, and considering the quantity of sources you have, probably reduce the troubles you may have.
First, go to pastebin (or other online services which allow storage of raw and public data) and paste the URL of all your feeds, one per line, such as this: http://pastebin.com/BvtKL4y7
Put the paste to public or unlisted (not private) and copy the ID of the paste (the last characters, after the /).
Then fetch the URLs using a fetch CSV module, put the output in a loop containing a fetch feed/fetch first feed (in your case).
Now, my web browser only prints latin characters, but I tried to get the name of your source feed in the title as you did. But as it's now an automatic process, the name of the feed must be found in the item! mainly I found the name in the beginning of the URL, expect for the yahoo.co.jp source, hence the 2nd and 3rd lines of the regex module.
Just after the regex module you can see what I meant with loop+string builder ;)