exp/norm: reverting to using strings.Repeat, as it doesn't look like exp/regexp is going to support returning multiple matches for a single repeated group.
exp/norm: reverting to using strings.Repeat, as it doesn't look like exp/regexp
is going to support returning multiple matches for a single repeated group.

R=r, rsc, mpvl
CC=golang-dev
http://codereview.appspot.com/5014045

dsriram/golang,pombredanne/go-deleteme,apparentlymart/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,gnanderson/go,tv42/old-go,apparentlymart/golang,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,apparentlymart/golang,apparentlymart/golang,gnanderson/go,tv42/old-go,dsriram/golang,dsriram/golang,gnanderson/go,dsriram/golang,tv42/old-go,tv42/old-go,gnanderson/go,apparentlymart/golang,dsriram/golang,dsriram/golang,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,dsriram/golang,pombredanne/go-deleteme,gnanderson/go,gnanderson/go