a(cfast)*
acfast
a(cfast)*
ac
a(cfast)+
acfast
t(est|emplate)
test
t(est|emplate)
template
t(est|emplate)
t
t(est|emplate)*
t
c*d*a*b*c*d*aba*b*
aaaaaab
a*b*aba*b*
ab