How to concatenate, format and then split again strings in Yahoo Pipes

Question

I am trying to fetch a feed and then add one field to every entry using Yahoo Pipes.

In order to get content of fields I'd like to add, I have to fetch some data from my server using Fetch Data (http://www.myserver.com/?get=author)

However I would like to get informations for all entries in just one request (http://www.myserver.com/?get=author1-author2-author3) instead of making as many requests as number of entries is.

My problem is that I can't figure out how to create string that would consist of all fields with "-" delimiter (author1-author2-author3...). I tried experiment with Loop but with no success.

Moreover, I can't find a way to join fetched data with entries. Loop doesn't seem deliver such function.

My feed:

<item><author>author1</author></item>
<item><author>author2</author></item>
<item><author>author3</author></item>

What I want to achive:

<item><author>author1</author><authorid>34</authorid></item>
<item><author>author2</author><authorid>54</authorid></item>
<item><author>author3</author><authorid>30</authorid></item>

I don't expect a running Pipe, just a tip how can I do it. Thank you.

Answer 1

If you have a web server why use Yahoo Pipes to join the data? It would be easier to perform server side with PHP.

Alternatively.. You could use the replace module with regex and work on the feed as a string but that's probably going to be an ugly hackjob of a pipe. Would need the URL for the donor feed and your site to help further.