Q1)Please correct me if i am wrong in understanding these quantifiers.
?(Zero or one)
This quantifier will search each digit seperately.For every digit it will give its index.If it does'nt find the digit ie(if there is character) it will give the corresponding index but it will report as empty.
*(Zero or More)
This quantifier will search for continous digits until it does'nt find character or spaces in between.It will represent the starting index of digits and entire digits as a one group.