acme: regex not mathing as much as possible

Considering the following text:

abc xyz

The following Edit command:

Edit ,x/[a-z]+/ s/.*/T&/g

Should result in

Tabc Txyz

But it seems like x is capturing single chars only, instead the full 3 char group, so the command results in :

TaTbTc TxTyTz

I tried to find the problem to fix it myself but could not find where the bug is. It seems to work fine in go sam and plan9port acme.