True, but there's also another factor: in Go it's easy to write string manipulation functions that are fast, while in most dynamic languages some regular expressions would run faster than your hand-written routine.
Perhaps, but I'm not 100% about that without some profiling.
For one, Go tends to offer string stuff implemented in Go, whereas dynamic languages usually delegate string operations to plain old C, which can be faster (especially when Unicode is added into the picture).
