Просто приходится думать о разнице между процедурами если хочется идти с конца.
> ‘re-search-forward’ finds the match whose > beginning is as close as possible to the starting point. If > ‘re-search-backward’ were a perfect mirror image, it would find the > match whose end is as close as possible. > […] > A true mirror-image of ‘re-search-forward’ would require a special > feature for matching regular expressions from end to beginning. > It’s not worth the trouble of implementing that.