abadon,
<body>
<script>
let str = "<a class='small minor' href='/?chat=$chat[id]&del_komm=$post[id]'>"
str = str.replace(/(<a.+href=['"])([^"']+)/g, function(a,b,c) {
return b + c.replace("?","").replace(/[=&]/g, "-")
})
document.body.append(str)
</script>
</body>