Add support for regular expressions

[kankaristo]

Please add regular expression support for replacing/modifying the tab title.

This would be much more powerful than the current removals, prefix and suffix. You could do all of those, but you could also do much more.

I'm mostly interested in removing usernames from the beginning of tab titles, since I always use the same user on a specific host I SSH into, so seeing the hostname is enough (and I often have the same username on many hosts, so the username is just noise and fills up the tab title). A simple regex replace like /^\w+@// would do that.