从JSON密钥中删除引号

My JSON data looks like this:

[{"title":"kunalsahu","start":"new Date($.now() + 158000000)","className":"bg-purple"}]

I would like the format to be like this:

[{title: 'kunalsahu',start: new Date($.now() + 158000000),className: 'bg-purple'}]

I don't know why you would want this as it's invalid JSON but try something like this:

$str = "[{"title":"kunalsahu","start":"new Date($.now() + 158000000)","className":"bg-purple"}]";
$str = preg_replace('/"([^"]+)"\s*:\s*/', '$1:', $str);
echo $str;