How to apply the condition on data?

I have arrays of binary numbers

I want to remove leading zeros

A = ['1001','0010','0']

B= '10101'

for i=1:3

a1 = A(i);

a2= regexprep(a1,'^0*','');

a3 = B(1:length(a2))

result = a2~=a3

end

For third entry of A , A(3)='0', I get empty output due to regexprep(a1,'^0*','');, but I want to apply condition or any other way so that if any entry of A in only zero then exclude this condition regexprep(a1,'^0*','');, so that for A(3)='0' , I can get a2=0, a3=1 and result=1

[KSSV]

What is the output you expect?

[Noor Fatima]

@KSSV thank you for your interest, I'm expecting the following

For A(1)='1001' ;output=0011

For A(2) = '0010' ; output=01

forA(3) = '0', output =1

[KSSV]

A(1)='1001' ;output=0011 or 1001?

A(3) = '0', output =1 or 0 ?

[Noor Fatima]

A(1)='1001' ;output=0011 or 1001? 0011

(a1=1001, a3=1010, ans = '1001' ~='1010'=0011)

Like for A(3) output is 1