<?php
$re = '~\bmyNumber=(\d+)~';
$str = "asdasdasd,sdfsdfsdf myNumber=1234, 2323 dfdfdf9898 sdfsdfdsf 234";
echo $m[1];
PD9waHAKCiRyZSA9ICd+XGJteU51bWJlcj0oXGQrKX4nOyAKJHN0ciA9ICJhc2Rhc2Rhc2Qsc2Rmc2Rmc2RmIG15TnVtYmVyPTEyMzQsIDIzMjMgZGZkZmRmOTg5OCBzZGZzZGZkc2YgMjM0IjsgCnByZWdfbWF0Y2goJHJlLCAkc3RyLCAkbSk7CmVjaG8gJG1bMV07