Removing every other character in a string using Java regex

Question

I have this homework problem where I need to use regex to remove every other character in a string.

In one part, I have to delete characters at index 1,3,5,... I hav

Answer 1

my regex is only incorrect if the input string length is odd. if it's even, then my regex works fine.

Change your expresion to .(.)? - the question mark makes the second character optional, which means it doesn't matter if input is odd or even