Convert Cloudinary URLs to named transformations using sed

convert_cloudinary_urls.sh

#!/bin/sh
#
# sed script to convert dynamic transformations on Cloudinary to named transformations
#
# The tricky part was getting the backreference syntax correct.

sed -E \
  's/bookbub\/image\/upload\/.+h_([0-9]{3}).+\/v[0-9]*/kobubob\/image\/upload\/t_ci_email_201608_dynamic_\1/' \
  previews/default_deals_mobile_improvements/secondary_data/promotions.json