r* matches zero or more occurrences of r.
r+ matches one or more occurrences of r.
r? matches zero or one occurrence of r.
r{m,n} matchesatleast "m"and at most "n"occurrencesof r.
r{m,} matchesatleast "m"occurrencesof r.
r{m} matches exactly "m" occurrences of r.
/ab+/ matches an a followed by one or more b's, not a sequence of ab's.
/a*/ will match any string; every stringhas zero or more a's.