In Portswigger's Burp I needed a way to do Match & Replace globally across all utilities, not just the proxy so I wrote an extension https://github.com/singe/burp_global_match_replace

@singe ICYMI: https://github.com/silentsignal/burp-piper

@buherator I’ll need to look closer but it feels like they would be more work than what I needed.

@singe You have a GUI to redirect all/some messages to a shell script (or whatever) where you can do the replace.