the problem is that the first 0 shoud not be touched but all following untill number !=0, except there is only one 0
i managed it as far as u can see in my code,but these 2 problems left
this is the pattern
this shoud be produced
given -> after regex
215000007801 -> 21507801
300000324002 -> 30324002
890000457651 -> 89457651
210004563401 -> 214563401
201045139158 -> 20145139158
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