Software to bulk edit .torrent files and replace some tracker announce by another

Hello,

im facing this issue. Im having folder with many old .torrent files. Now i need to replace original old tracker announce URL by a new one or new multiple ones.

How to do it?

When i open some file in editor, i see on the first line:

d8:announce80:announceurlhere:announce-listll80:announceurlhere:announceurlhere:announceurlhere:created by13:uTorrent/180013:creation datei1229880008e8:encoding5:UTF-84:infod5:filesld6:lengthi345257984e4:pathl60.................

I would use sed for this, but here's a nice GUI-based editor.

Thank you, it worked and i would strongly suggest to first backup whole folder. And then test modified torrent files.
I think in my case some files was read only and so the SW kept them unmodified.