Advent of Code 2021 Day 3 Part 2

#https://adventofcode.com/2021/day/3
 #Part 2 using Regex

#Select first bit of the previous answer to create the regex
$oxygen_regex = "^$($gamma[0])"
$co2_regex = "^$($epsilon[0])"

#Empty variable to store the answers
$oxygen_binary = ""
$co2_binary = ""

#Looping from second to last bit of each input as we already have the first one from previous part
1..11 | % {
    $bit = $_

    #custom object acting like a meter for both oxygen and co2
    $bit_count = [pscustomobject]@{"0"=0;"1"=0 ;"2"=0;"3"=0}

    #if only 1 match left, select it as the answer
    if(($binary -match $oxygen_regex).Count   -eq 1){
        $oxygen_binary = $binary -match $oxygen_regex
    }
    else{
        #Select each element from the puzzle input matching the regex
        $binary -match $oxygen_regex | % {
            if ($_[$bit] -eq "1"){
                $bit_count.1 += 1
            }
            else{
                $bit_count.0 += 1
            }
        }
        #Append the regex deppending on the most common bit for the current index
        if ($bit_count.0 -gt $bit_count.1){
            $oxygen_regex += "0"
        }
        else{
            $oxygen_regex += "1"
        }
    }

    #Same part/logic applied, but reverted for co2
    if(($binary -match $co2_regex).Count   -eq 1){
        $co2_binary = $binary -match $co2_regex
    }
    else{
        $binary -match $co2_regex | % {
            if ($_[$bit] -eq "1"){
                $bit_count.3 += 1
            }
            else{
                $bit_count.2 += 1
            }
        }
        if ($bit_count.3 -lt $bit_count.2){
            $co2_regex += "1"
        }
        else{
            $co2_regex += "0"
        }
    }

}

$part_2_result = ([convert]::ToInt32($co2_binary,2)) * ([convert]::ToInt32($oxygen_binary,2))