'regex get number betwen quotes

i have difrent string json type egz formats in line

{"env":"stato","usc":"00000000","isc":"000100","sn":"0120xxxxmacxxx"}
{{"cmd":"stat"},{"usc":"00000000",{"isc":"1001000"}},"sn":"0120xxxxmacxxx"}
{{"cmd":"status","usc":"00000000","isc":"1110001"},"sn":"0120xxxxmacxxx"}
{'stat':'dev',{data:['usc':'00000000','isc':'10010001']},'sn':'0120xxxxmacxxx'}

need single regex by get only numbers 0-1 format in quotes after "isc":"NEED THIS NUMBERS ONLY" in single php regex for all formats. egs

$json = '{"env":"stato","usc":"00000000","isc":"00010000","sn":"0120xxxxmacxxx"}';
$find = "isc";    
function find_data($find,$json){
  preg_match('/,[{[]*["\']'.$find.'["\']:["\'](.*)["\'][}]]*,/i', $json, $r);
  return $r;
}

json loop solution does not come! json search can only be accepted on one line of code, I have limited computing and memory resources in atmega 16

thx for help

phpjsonstringfind


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