This page is part of the web mail archives of SRFI 115 from before July 7th, 2015. The new archives for SRFI 115 contain all messages, not just those from before July 7th, 2015.
There already exists an extremely widely used regular _expression_ syntax designed for brevity. We do not need to standardize another one designed for brevity.
When I asked early on, "what are the benefits of the SRE syntax" I got a strong reaction. To me, the advantages of list structure does not outweigh the disadvantages of having to learn yet more cryptic operator names.
I might as well just use PCREs; at least then anything do I retain can be used outside the world of Scheme.