I use phocagallery which automatically creates thumbs for each picture according to a specific pattern.
For exemple, if a picture is called IMGxxx.jpg, phocagallery will automatically create:
phoca_thumb_s_IMGxxx.jpg
phoca_thumb_m_IMGxxx.jpg
phoca_thumb_m2_IMGxxx.jpg
phoca_thumb_m3_IMGxxx.jpg
phoca_thumb_l_IMGxxx.jpg
etc.

Since IMGxxx.jpg is not very descriptive, I renamed all such cryptic names with more human readable names, which I now need to redirect. But rather than redirect each picture + its automatically created thumbs, for example :
From: IMGxxx.jpg To: new-human-readable-name.jpg
From: phoca_thumb_s_IMGxxx.jpg To: phoca_thumb_s_new-human-readable-name.jpg
From: phoca_thumb_m_IMGxxx.jpg To: phoca_thumb_m_new-human-readable-name.jpg
From: phoca_thumb_m2_IMGxxx.jpg To: phoca_thumb_m2_new-human-readable-name.jpg
From: phoca_thumb_m3_IMGxxx.jpg To: phoca_thumb_m3_new-human-readable-name.jpg
From: phoca_thumb_l_IMGxxx.jpg To: phoca_thumb_l_new-human-readable-name.jpg

I'd rather (of course...) write a simple rule that would cover all these cases, something like:
From: {some-macro-and-regex-magic}IMGxxx.jpg To: {some-macro-and-regex-magic}new-human-readable-name.jpg
where the picture file name would be the only matching pattern, while the suffixe of the picture file name (if there is one) would not get modified.

Can this be implemented in ReDJ ? I haven't been able to find the way to do it.

Works perfectly! Thank you!!!