'Can i find certain text inside javascript code using selenium

For example the website have this code

<html>
<head> Product Display </head>
<body>
<b> Product </b>
<script> 
document.getElementById("iframe").src = "productid.php?code=75021&productno=111222");
</script>
<iframe id="iframe"></iframe>
</html>

What I wanted is the code "75021", I tried searching anywhere but can't find any solution. The product code is unique and changing every time, I guess I need REGEX too ?



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