I am on WordPress v3.2.1 plugin version 1.4.11 and I’ve tested on Chrome 14.0.835.186, Firefox 6.0.1.
For me, the “replace and save button” works but the inline replacement is not working, neither the “replace” button, nor the edit manually and save function.
Please see what I could make of the Firebug console output below. I'm not much of a whiz at Firebug but I tried. I have no idea if it's relevant, but that's what came out when I clicked "Replace" inline.
I’ve used and loved Search Regex since probably like 2008, I have no idea (years! thank you!). Hope this can get fixed!