Hi. Here is the link for Cashel. The map of parishes is interactive. Have a go at site. It is well designed and quite easy to navigate and search once your eyes adjust to the old handwriting! Zoom in will help you to read it. (I just zoom in once)
No, not searchable by name. But start in Cashel parish marriages a few years either side of when you think it occured. If not there expand years searched or look at neighbouring parishes.
I have been breaking down some brick walls and very pleased!
