what the different between these two regex expression ?
AB\{4\} and (AB)\{4\}
for the first expression I think that it repeat B 4 times, then for second expression it
repeats AB 4 times. When I try to test the second expression using ABABABAB nothing matches.
(AB){4}
if it's a ERE,\(AB\)\{4\}
if it's a BRE.